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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2020	Aug. 04, 2020
Cover [Abstract]
Document type	10-Q
Document period end date	Jun. 30, 2020
Amendment flag	false
Entity registrant name	DIODES INC /DEL/
Entity central index key	0000029002
Current fiscal year end date	--12-31
Entity filer category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity common stock shares outstanding		51,831,464
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Trading Symbol	DIOD
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	002-25577
Entity Tax Identification Number	95-2039518
Entity Address, Address Line One	4949 Hedgcoxe Road
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Plano
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75024
City Area Code	972
Local Phone Number	987-3900
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, Par Value $0.66 2/3
Security Exchange Name	NASDAQ
Document Quarterly Report	true
Document Transition Report	false

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 503,206	$ 258,390
Short-term investments	3,652	4,825
Accounts receivable, net of allowances of $3,234 and $4,866 at June 30, 2020 and December 31, 2019, respectively	268,618	260,322
Inventories	255,828	236,472
Prepaid expenses and other	95,181	49,950
Total current assets	1,126,485	809,959
Property, plant and equipment, net	450,615	469,574
Deferred income tax	18,113	17,516
Goodwill	152,140	141,318
Intangible assets, net	118,076	119,523
Other long-term assets	71,734	81,494
Total assets	1,937,163	1,639,384
Current liabilities:
Line of credit	63,668	13,342
Accounts payable	138,692	122,148
Accrued liabilities and other	103,859	100,571
Income tax payable	6,064	16,156
Current portion of long-term debt	13,052	33,105
Total current liabilities	325,335	285,322
Long-term debt, net of current portion	282,271	64,401
Deferred tax liabilities	16,244	16,333
Other long-term liabilities	117,686	120,545
Total liabilities	741,536	486,601
Commitments and contingencies (See Note 9)
Stockholders' equity
Preferred stock - par value $1.00 per share; 1,000,000 shares authorized; no shares issued or outstanding
Common stock - par value $0.66 2/3 per share; 70,000,000 shares authorized; 51,598,528 and 51,206,969, issued and outstanding at June 30, 2020 and December 31, 2019, respectively	35,389	35,111
Additional paid-in capital	433,989	427,262
Retained earnings	831,159	789,958
Treasury stock at cost, 1,482,915 and 1,457,206, at June 30, 2020 and December 31, 2019, respectively	(38,660)	(37,768)
Accumulated other comprehensive loss	(118,492)	(108,139)
Total stockholders' equity	1,143,385	1,106,424
Noncontrolling interest	52,242	46,359
Total equity	1,195,627	1,152,783
Total liabilities and stockholders' equity	$ 1,937,163	$ 1,639,384

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 3,234	$ 4,866
Preferred stock par value	$ 1.00	$ 1.00
Preferred stock shares authorized	1,000,000	1,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock par value	$ 0.666	$ 0.666
Common stock shares authorized	70,000,000	70,000,000
Common stock shares issued	51,598,528	51,206,969
Common stock shares outstanding	51,598,528	51,206,969
Treasury stock, shares	1,482,915	1,457,206

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 288,669	$ 322,006	$ 569,386	$ 624,299
Cost of goods sold	187,177	200,018	372,052	389,900
Gross profit	101,492	121,988	197,334	234,399
Operating expenses
Selling, general and administrative	45,372	47,333	87,587	91,021
Research and development	21,322	21,707	45,000	43,877
Amortization of acquisition related intangible assets	4,021	4,536	8,242	9,020
Other operating (income)	(92)	(104)	(216)	(158)
Total operating expense	70,623	73,472	140,613	143,760
Income from operations	30,869	48,516	56,721	90,639
Other income (expense)
Interest income	168	633	441	1,508
Interest expense	(2,653)	(2,011)	(3,898)	(4,156)
Foreign currency loss, net	(3,600)	(496)	(3,525)	(560)
Other income	1,274	1,235	1,275	2,480
Total other expense	(4,811)	(639)	(5,707)	(728)
Income before income taxes and noncontrolling interest	26,058	47,877	51,014	89,911
Income tax provision	4,670	11,174	9,226	21,472
Net income	21,388	36,703	41,788	68,439
Less net income attributable to noncontrolling interest	(355)	(419)	(587)	(439)
Net income attributable to common stockholders	$ 21,033	$ 36,284	$ 41,201	$ 68,000
Earnings per share attributable to common stockholders:
Basic	$ 0.41	$ 0.72	$ 0.80	$ 1.35
Diluted	$ 0.40	$ 0.70	$ 0.78	$ 1.32
Number of shares used in earnings per share computation:
Basic	51,527	50,658	51,431	50,529
Diluted	52,569	51,620	52,517	51,566

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest [Abstract]
Net income	$ 21,388	$ 36,703	$ 41,788	$ 68,439
Unrealized (loss) gain on defined benefit plan, net of tax	(16,570)	1,020	(6,851)	(5,009)
Unrealized gain (loss) on swaps and collars, net of tax	817	503	(621)	(3,406)
Unrealized foreign currency gain (loss), net of tax	6,733	(6,900)	(2,881)	(1,964)
Comprehensive income	12,368	31,326	31,435	58,060
Less: Comprehensive income attributable to noncontrolling interest	(355)	(419)	(587)	(439)
Total comprehensive income attributable to common stockholders	$ 12,013	$ 30,907	$ 30,848	$ 57,621

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total Diodes Incorporated Stockholders' Equity	Noncontrolling Interest
BALANCE at Dec. 31, 2018	$ 977,432	$ 34,454	$ (37,768)	$ 399,915	$ 636,708	$ (101,846)	$ 931,463	$ 45,969
Common stock shares beginning at Dec. 31, 2018		51,678,000	(1,457,000)
Total comprehensive income	58,060				68,000	(10,379)	57,621	439
Noncontrolling interests	3,343							3,343
Dividends to noncontrolling interest	(2,568)							(2,568)
Common stock issued for share-based plans	6,705	$ 349		6,356			6,705
Common stock issued for share-based plans, shares		524,000
Share-based compensation	9,775			9,775			9,775
Tax related to net share settlement	(1,595)			(1,595)			(1,595)
BALANCE at Jun. 30, 2019	1,051,152	$ 34,803	$ (37,768)	414,451	704,708	(112,225)	1,003,969	47,183
Common stock shares ending at Jun. 30, 2019		52,202,000	(1,457,000)
BALANCE at Mar. 31, 2019	1,017,298	$ 34,704	$ (37,768)	410,163	668,424	(106,848)	968,675	48,623
Common stock shares beginning at Mar. 31, 2019		52,054,000	(1,457,000)
Total comprehensive income	31,326				36,284	(5,377)	30,907	419
Common stock issued for share-based plans	626	$ 99		(61)			38	588
Common stock issued for share-based plans, shares		148,000
Share-based compensation	2,852			5,299			5,299	(2,447)
Tax related to net share settlement	(950)			(950)			(950)
BALANCE at Jun. 30, 2019	1,051,152	$ 34,803	$ (37,768)	414,451	704,708	(112,225)	1,003,969	47,183
Common stock shares ending at Jun. 30, 2019		52,202,000	(1,457,000)
BALANCE at Dec. 31, 2019	$ 1,152,783	$ 35,111	$ (37,768)	427,262	789,958	(108,139)	1,106,424	46,359
Common stock shares beginning at Dec. 31, 2019	51,206,969	52,664,000	(1,457,000)
Total comprehensive income	$ 31,435				41,201	(10,353)	30,848	587
Acquisition of non-controlling interest	(6,153)			(1,225)			(1,225)	(4,928)
Contributions from noncontrolling interests	11,776							11,776
Dividends to noncontrolling interest	(1,553)							(1,552)
Common stock issued for share-based plans	1,065	$ 278		787			1,065
Common stock issued for share-based plans, shares		418,000
Share-based compensation	11,678			11,678			11,678
Deferred compensation plan			$ (892)	892
Deferred compensation plan, shares			(26,000)
Tax related to net share settlement	(5,405)			(5,405)			(5,405)
BALANCE at Jun. 30, 2020	$ 1,195,627	$ 35,389	$ (38,660)	433,989	831,159	(118,492)	1,143,385	52,242
Common stock shares ending at Jun. 30, 2020	51,598,528	53,082,000	(1,483,000)
BALANCE at Mar. 31, 2020	$ 1,182,289	$ 35,289	$ (38,457)	427,543	810,126	(109,472)	1,125,029	57,260
Common stock shares beginning at Mar. 31, 2020		52,932,000	(1,481,000)
Total comprehensive income	12,368				21,033	(9,020)	12,013	355
Acquisition of non-controlling interest	(6,153)			(1,225)			(1,225)	(4,928)
Contributions from noncontrolling interests	999							999
Dividends to noncontrolling interest	(1,445)							(1,444)
Common stock issued for share-based plans	1,065	$ 100		965			1,065
Common stock issued for share-based plans, shares		150,000
Share-based compensation	7,441			7,441			7,441
Deferred compensation plan			$ (203)	203
Deferred compensation plan, shares			(2,000)
Tax related to net share settlement	(938)			(938)			(938)
BALANCE at Jun. 30, 2020	$ 1,195,627	$ 35,389	$ (38,660)	$ 433,989	$ 831,159	$ (118,492)	$ 1,143,385	$ 52,242
Common stock shares ending at Jun. 30, 2020	51,598,528	53,082,000	(1,483,000)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 41,788	$ 68,439
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions
Depreciation	45,685	45,409
Amortization of intangible assets	8,242	9,020
Share-based compensation expense	12,394	9,775
Deferred income taxes	(2,317)	(74)
Other	1,084	(696)
Changes in operating assets:
Change in accounts receivable	(7,573)	(11,993)
Change in inventory	(19,770)	577
Change in other operating assets	7,422	(6,412)
Changes in operating liabilities:
Change in accounts payable	16,767	(7,036)
Change in accrued liabilities	(6,429)	4,454
Change in income tax payable	(10,159)	1,247
Change in other operating liabilities	(400)	(2,222)
Net cash flows provided by operating activities	86,734	110,488
Cash flows from investing activities
Acquisitions, net of cash received	591	(33,029)
Purchases of property, plant and equipment	(30,728)	(50,698)
Proceeds from maturity of short-term investments	6,186	9,843
Purchases of short-term investments	(5,051)	(9,000)
Additional acquisition of noncontrolling interest	(6,130)
Other	1,084	367
Net cash and cash equivalents used in investing activities	(34,048)	(82,517)
Cash flows from financing activities
Advances on lines of credit and short-term debt	53,647	6,769
Repayments of line of credit and short-term debt	(3,498)	(1,461)
Taxes paid related to net share settlement	(5,405)	(1,595)
Proceeds from long-term debt	589,331	161,237
Repayments of long-term debt	(390,334)	(203,385)
Net proceeds from issuance of common stock	1,066	6,706
Repayment of and proceeds from finance lease obligation	(445)	(588)
Dividend distribution to noncontrolling interests	(108)	(1,180)
Other	(2,470)	542
Net cash and cash equivalents (used in) provided by financing activities	241,784	(32,955)
Effect of exchange rate changes on cash and cash equivalents	644	(35)
Change in cash and cash equivalents, including restricted cash	295,114	(5,019)
Cash and cash equivalents, beginning of period, including restricted cash	259,507	241,833
Cash and cash equivalents, end of period, including restricted cash	554,621	236,814
Supplemental Cash Flow Information
Interest paid during the period	1,746	4,107
Taxes paid during the period	21,743	23,199
Non-cash investing and financing activities:
Accounts payable balance related to the purchase of property, plant and equipment	7,569	14,234
Dividend payable to noncontrolling interest	$ 1,454	$ 1,400

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Current assets:
Cash and cash equivalents	$ 503,206	$ 235,352
Restricted cash (included in other current assets)	51,415	1,462
Total cash, cash equivalents and restricted cash	$ 554,621	$ 236,814

Summary of Operations and Significant Accounting Policies

6 Months Ended

Jun. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Operations and Significant Accounting Policies

NOTE 1 – Summary of Operations and Significant Accounting Policies

Summary of Operations

Diodes Incorporated, together with its subsidiaries (collectively, the “Company,” “we” or “our”) (Nasdaq: DIOD), is a leading global manufacturer and supplier of high-quality, application-specific standard products within the broad discrete, logic, analog and mixed-signal semiconductor markets. We serve the consumer electronics, computing, communications, industrial, and automotive markets. Our products include diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. We also have timing, connectivity, switching, and signal integrity solutions for high-speed signals. Our corporate headquarters and Americas’ sales offices are located in Plano, Texas and Milpitas, California. Design, marketing, and engineering centers are located in Plano; Milpitas; Taipei, Taoyuan City and Zhubei City, Taiwan; Oldham, England; and Neuhaus, Germany. Our wafer fabrication facilities are located in Oldham and Shanghai, China and Greenock, Scotland. We have assembly and test facilities located in Shanghai, Jinan and Chengdu, China, as well as in Hong Kong, Neuhaus and Taipei. Additional engineering, research and development, sales, warehouse, and logistics offices are located in Taipei; Hong Kong; Oldham; Shanghai; Shenzhen and Yangzhou, China; Seongnam-si, South Korea; Munich, Germany; and Tokyo, Japan, with support offices throughout the world.

Basis of Presentation

The condensed consolidated financial data at December 31, 2019 is derived from audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2019 filed with the Securities and Exchange Commission (“SEC”) on February 12, 2020 (“Form 10-K”). The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States Generally Accepted Accounting Principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q. They do not include all information and footnotes necessary for a fair presentation of financial position, operating results and cash flows in conformity with GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in our Form 10-K. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the operating results for the period presented have been included in the interim period. Operating results for the three and six months ended June 30, 2020 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2020.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates. As permitted under GAAP, interim accounting for certain expenses, including income taxes, are based on full year forecasts. For interim financial reporting purposes, income taxes are recorded based upon estimated annual effective income tax rates taking into consideration discrete items occurring in a quarter.

Dollar amounts and share amounts are presented in thousands, except per share amounts, unless otherwise noted. Certain prior year’s balances may have been reclassified to conform to the current financial statement presentation.

Recently Issued Accounting Pronouncements

In March 2020, the Financial Accounting Standards Board issued Accounting Standards (“FASB”) Update (“ASU”) No. 2020-04 Reference Rate Reform (Topic 848). ASU No. 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU No. 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the second quarter of 2020; the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.

In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, which requires measurement and recognition of expected credit losses for financial assets held. We adopted ASU No. 2016-13 effective January 1, 2020. The adoption of ASU No. 2016-13 did not have a material impact on our consolidated financial statements and related disclosures.

Earnings Per Share

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 2 – Earnings per Share

Earnings per share (“EPS”) is calculated by dividing net income attributable to common stockholders by the weighted-average number of shares of Common Stock outstanding during the period. Diluted EPS is calculated similarly but includes potential dilution from the exercise of stock options and stock awards, except when the effect would be anti-dilutive. During the three and six month ended June 30, 2020 and 2019 we paid no dividends on our Common Stock.

The table below sets forth the reconciliation between net income and the weighted average shares outstanding used for calculating basic and diluted EPS:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Earnings (numerator)
Net income attributable to common stockholders	$	21,033	$	36,284	$	41,201	$	68,000

Shares (denominator)
Weighted average common shares outstanding (basic)		51,527		50,658		51,431		50,529
Dilutive effect of stock options and stock awards outstanding		1,042		962		1,086		1,037
Adjusted weighted average common shares outstanding (diluted)		52,569		51,620		52,517		51,566

Earnings per share attributable to common stockholders
Basic	$	0.41	$	0.72	$	0.80	$	1.35
Diluted	$	0.40	$	0.70	$	0.78	$	1.32

Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive		8		131		3		95

Inventories

6 Months Ended

Jun. 30, 2020

Inventory Disclosure [Abstract]

Inventories

NOTE 3 – Inventories

The table below sets forth inventories which are stated at the lower of cost or net realizable value:

	June 30, 2020		December 31, 2019
Finished goods	$	69,174	$	62,900
Work-in-progress		53,457		55,082
Raw materials		133,197		118,490
Total	$	255,828	$	236,472

Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

NOTE 4 – Goodwill and Intangible Assets

The table below sets forth the changes in goodwill:

Balance at December 31, 2019	$	141,318
Savitech acquisition (see Note 14 for additional information)		12,702
Foreign currency translation adjustment		(1,880	)
Balance at June 30, 2020	$	152,140

The table below sets forth the value of intangible assets, other than goodwill:

	June 30,			December 31,
	2020			2019
Intangible assets subject to amortization:
Gross carrying amount	$	249,647		$	239,975
Accumulated amortization		(132,693	)		(124,452	)
Foreign currency translation adjustment		(8,110	)		(9,842	)
Total		108,844			105,681
Intangible assets with indefinite lives:
Gross carrying amount		10,412			14,883
Foreign currency translation adjustment		(1,180	)		(1,041	)
Total		9,232			13,842
Total intangible assets, net	$	118,076		$	119,523

The table below sets forth amortization expense related to intangible assets subject to amortization:

Amortization expense	2020		2019
Three months ended June 30,	$	4,021	$	4,536
Six months ended June 30,	$	8,242	$	9,020

Income Tax Provision

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Income Tax Provision

NOTE 5 – Income Tax Provision

The table below sets forth information related to our income tax expense:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2020			2019			2020			2019
Domestic pre-tax income	$	7,707		$	8,064		$	12,975		$	20,550
Foreign pre-tax income	$	18,351		$	39,813		$	38,039		$	69,361
Income tax provision	$	4,670		$	11,174		$	9,226		$	21,472
Effective tax rate		17.9	%		23.3	%		18.1	%		23.9	%
Impact of tax holidays on tax expense	$	(241	)	$	572		$	(1,315	)	$	849
Earnings per share impact of tax holidays:
Basic	$	0.01		$	(0.01	)	$	0.03		$	(0.02	)
Diluted	$	0.01		$	(0.01	)	$	0.03		$	(0.02	)

The decrease in the effective tax rate for the three and six months ended June 30, 2020 when compared to the three and six months ended June 30, 2019, is primarily attributable to a decrease in non-U.S. withholding taxes and a net increase in favorable U.S. permanent differences.

Our undistributed foreign earnings continue to be indefinitely reinvested in foreign operations, with limited exceptions related to earnings of certain European and Asian subsidiaries. Any future distributions of foreign earnings will not be subject to additional U.S. income tax, but may be subject to non-U.S. withholding taxes.

We file income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. We are no longer subject to U.S. federal income tax examinations by tax authorities for tax years before 2012, or for the 2015 tax year. We are no longer subject to China income tax examinations by tax authorities for tax years before 2010. With respect to state and local jurisdictions and countries outside of the U.S. (other than China), with limited exceptions, the Company is no longer subject to income tax audits for years before 2014. Although the outcome of tax audits is always uncertain, the Company believes that adequate amounts of tax, interest and penalties, if any, have been provided for in the Company’s reserve for any adjustments that may result from currently pending tax audits. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in interest expense. As of June 30, 2020, the gross amount of unrecognized tax benefits was approximately $39.6 million.

It is reasonably possible that the amount of the unrecognized benefit with respect to certain of the Company’s unrecognized tax positions will significantly increase or decrease within the next 12 months. At this time, an estimate of the range of the reasonably possible outcomes cannot be made.

In response to the outbreak of the novel strain of coronavirus (“COVID-19”) pandemic, the United States Coronavirus Aid, Relief, and Economic Security (“CARES”) Act was enacted on March 27, 2020. We do not expect the CARES Act to have a material impact on our financial statements because we do not qualify for most of the relief provisions prescribed in the CARES Act. We will continue to assess the impacts of the CARES Act and any other legislation adopted by the United States government or other applicable governmental agencies in response to COVID-19 as additional guidance is published by the relevant authorities.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Share-Based Compensation

6 Months Ended

Jun. 30, 2020

Share Based Compensation [Abstract]

Share-Based Compensation

NOTE 6 – Share-Based Compensation

All share-based compensation is attributable to share grants. All outstanding stock options are fully vested, and all expense related to stock options has been recognized in previous periods. Approximately $1.1 million of cash proceeds were received from stock option exercises during the six months ended June 30, 2020. The table below sets forth the line items where share-based compensation expense was recorded:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Cost of goods sold	$	257	$	259	$	530	$	384
Selling, general and administrative		6,715		4,309		10,426		7,946
Research and development		729		730		1,438		1,445
Total share-based compensation expense	$	7,701	$	5,298	$	12,394	$	9,775

Share Grants – Restricted stock awards and restricted stock units generally vest in equal annual installments over a four-year period. All new grants are granted under the Company’s 2013 Equity Incentive Plan, and there will be no additional share grants under the 2001 Omnibus Equity Incentive Plan. Restricted stock grants are measured based on the fair market value of the underlying stock on the date of grant, and compensation expense is recognized on a straight-line basis over the requisite four-year service period. During the second quarter of 2020, in connection with the retirement of a member of the Company’s board of directors, the Company modified that director’s unvested RSU grants to vest upon his retirement. The shares subject to the modified grants will be released to that board member as if they were vesting under the original vesting timeline. In connection with this modification, the Company recorded additional expense of approximately $1.7 million.

Performance stock units (“PSUs”) are measured based on the fair market value of the underlying stock on the date of grant and compensation expense is recognized over the three-year performance period, with adjustments made to the expense to recognize the probable payout percentage. PSUs will vest upon the Company achieving a cumulative 3-year non-GAAP operating income target for the applicable periods.

As of June 30, 2020, total unrecognized share-based compensation expense related to share grants was approximately $43.5 million, before income taxes, and is expected to be recognized over a weighted average period of approximately 2.1 years.

Segment Information and Net Sales

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Segment Information and Net Sales

NOTE 7 – Segment Information and Net Sales

Segment Reporting. For financial reporting purposes, we operate in a single segment, standard semiconductor products, through our various manufacturing and distribution facilities. We aggregate our products because the products are similar and have similar economic characteristics, use similar production processes and share the same customer type. Our primary operations include operations in Asia, North America and Europe. During the three months ended June 30, 2019, one customer, a broad-based global distributor that sells to thousands of different end users, accounted for 10% or $31.5 million of our net sales. No customer accounted for 10% or greater of our net sales during any other period presented. No customer accounted for 10% or more of our outstanding accounts receivable at any point in the periods presented in this report.

The tables below set forth net sales based on the location of the subsidiary producing the net sale.

Three Months Ended June 30, 2020	Asia			North America			Europe			Consolidated
Total sales	$	323,439		$	190,543		$	53,785		$	567,767
Intercompany elimination		(133,552	)		(121,545	)		(24,001	)		(279,098	)
Net sales	$	189,887		$	68,998		$	29,784		$	288,669


Three Months Ended June 30, 2019	Asia			North America			Europe			Consolidated
Total sales	$	319,740		$	173,694		$	66,124		$	559,558
Intercompany elimination		(116,105	)		(94,278	)		(27,169	)		(237,552	)
Net sales	$	203,635		$	79,416		$	38,955		$	322,006

As of and for the
Six Months Ended June 30, 2020	Asia			North America			Europe			Consolidated
Total sales	$	625,302		$	358,715		$	112,786		$	1,096,803
Intercompany elimination		(250,473	)		(226,009	)		(50,935	)		(527,417	)
Net sales	$	374,829		$	132,706		$	61,851		$	569,386

Property, plant and equipment, net	$	355,704		$	24,435		$	70,476		$	450,615
Total assets	$	1,494,605		$	230,888		$	211,670		$	1,937,163

As of and for the
Six Months Ended June 30, 2019	Asia			North America			Europe			Consolidated
Total sales	$	593,640		$	274,974		$	117,176		$	985,790
Intercompany elimination		(189,702	)		(132,194	)		(39,595	)		(361,491	)
Net sales	$	403,938		$	142,780		$	77,581		$	624,299

Property, plant and equipment, net	$	399,378		$	22,450		$	48,862		$	470,690
Total assets	$	1,190,443		$	235,248		$	188,468		$	1,614,159

Disaggregation of Net Sales. We disaggregate net sales from contracts with customers into direct sales and distribution sales (“Distributors”) and by geographic area. Direct sales customers consist of those customers using our product in their manufacturing process, and Distributors are those customers who resell our products to third parties. We deliver our products to customers around the world for use in consumer electronics, computing, communications, industrial and automotive. Further, most of our contracts are fixed-price arrangements, and are short term in nature, ranging from days to several months.

The tables below set forth net sales for the Company disaggregated into geographic locations based on shipment and by type (direct sales or Distributor) for the three months and six months ended June 30, 2020 and 2019:

	Three Months Ended
	June 30,
Net Sales by Region	2020		2019
Asia	$	223,056	$	239,082
Europe		43,145		46,050
Americas		22,468		36,874
Total net sales	$	288,669	$	322,006

Net Sales by Type
Direct sales	$	92,671	$	108,931
Distributor sales		195,998		213,075
Total net sales	$	288,669	$	322,006

	Six Months Ended
	June 30,
Net Sales by Region	2020		2019
Asia	$	433,861	$	463,371
Europe		90,076		84,444
Americas		45,449		76,484
Total net sales	$	569,386	$	624,299

Net Sales by Type
Direct sales	$	280,581	$	195,289
Distributor sales		288,805		429,010
Total net sales	$	569,386	$	624,299

Net sales from products shipped to China was $152.4 million and $160.3 million for the three months ended June 30, 2020 and 2019, respectively and $291.3 million and $311.8 million for the six months ended June 30, 2020 and 2019, respectively.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Debt

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Debt

NOTE 8 – Debt

Our Asia subsidiaries maintain credit facilities with several financial institutions through our foreign entities worldwide totaling $165.5 million. Other than two Taiwanese credit facilities that are collateralized by assets, our foreign credit lines are unsecured, uncommitted, repayable on demand, terminable by the lender at any time and contain no restrictive covenants. Interest payments are due monthly on outstanding amounts under the credit lines. The unused and available credit under the various facilities as of June 30, 2020, was approximately $101.4 million, net of a $63.7 million advanced under our foreign credit lines and $0.4 million credit used for import and export guarantee. In connection with our Asia credit facilities $51.4 million of cash deposits have been restricted in support of a corresponding loan amount.

On May 29, 2020, the Company, Diodes Holding B.V. (the “Foreign Borrower” and, collectively with the Company, the “Borrowers”), and certain subsidiaries of the Company as guarantors, entered into a Second Amended and Restated Credit Agreement (the “Credit Agreement”) that amends and restates that certain Amended and Restated Credit Agreement dated as of October 26, 2016 (as amended, modified and/or supplemented from time to time prior May 29, 2020, the “Existing Credit Agreement”). Certain capitalized terms used in this description of the Credit Agreement have the meanings given to them in the Credit Agreement. The Company analyzed this amendment pursuant to the guidance in ASC No. 470-50, Debt—Modifications and Extinguishments. The Company determined that certain lenders had changes in cash flows which were substantially different as a result of the amendment, which resulted in a debt extinguishment of $52.2 million and a loss on extinguishment and third-party fees of $0.7 million being expensed in the three-month period ended June 30, 2020.

The Credit Agreement rebalances the Company’s existing senior credit facilities under the Existing Credit Agreement from (x) aggregate credit facilities of $500,000,000, consisting of (A) a $250,000,000 revolving senior credit facility, which included a $10,000,000 swing line sublimit, a $10,000,000 letter of credit sublimit, and a $20,000,000 alternative currency sublimit, and (B) a $250,000,000 term loan to (y) aggregate credit facilities of $670,000,000 consisting of (A) an acquisition draw term commitment of $340,000,000 (the “Acquisition Draw Term Commitment”), (B) an initial term commitment of $180,000,000 (the “Initial Term Commitment” and, together with the Acquisition Draw Term Commitment, the “Term Loan”) and (C) a $150,000,000 revolving

senior credit facility (the “Revolver”), which includes a $20,000,000 uncommitted swing line submit, a $10,000,000 letter of credit sublimit, and a $40,000,000 alternative currency sublimit.

The Revolver and the Term Loan mature on May 29, 2023 (the “Maturity Date”). Both the term loan portion and the revolving portion of the Credit Agreement bear an interest rate at LIBOR or similar other indices plus a specified margin. The Company plans to use a portion of the proceeds available under the Revolver and the Term Loan (i) to finance the Company’s previously announced acquisition of Lite-On Semiconductor Corporation, (ii) to refinance certain existing indebtedness of the Borrowers and their subsidiaries under the Existing Credit Agreement and (iii) for working capital, capital expenditures, and other lawful corporate purposes, including, without limitation, financing permitted acquisitions.

The Credit Agreement contains certain financial and non-financial covenants, including, but not limited to, a maximum Consolidated Leverage Ratio, a minimum Consolidated Fixed Charge Coverage Ratio, and restrictions on liens, indebtedness, investments, fundamental changes, dispositions, and restricted payments (including dividends and share repurchases). These covenants are generally similar to the corresponding covenants in the Existing Credit Agreement, except that certain amounts permitted as exceptions to negative covenants restricting liens, indebtedness, investments, dispositions and restricted payments have been revised, and additional exceptions to certain negative covenants have been added, including increased capacity for certain intercompany Indebtedness and Investment (including existing Lite-On Indebtedness), and the right to enter into certain securitization transactions and receivables facilities, subject to limitations set forth in the Credit Agreement. Furthermore, under the Credit Agreement, restricted payments, including dividends and share repurchases, are permitted in certain circumstances, including while the pro forma Consolidated Leverage Ratio is, both before and after giving effect to any such restricted payment, at least 0.25 to 1.00 less than the maximum permitted under the Credit Agreement.

In addition to the liquidity provided by the Credit Agreement, our 51% owned subsidiary, ERIS Technology Corporation (“ERIS”), borrowed $13.7 million through a short-term loan and $27.0 million on a long-term basis from local Taiwan banks. The ERIS debt matures in periods from 2020 through 2033.

Borrowings outstanding as of June 30, 2020 and December 31, 2019, are set forth in the table below:

	June 30,			December 31,				Current Amount
Description	2020			2019			Interest Rate	Maturity
Short-term debt	$	63,668		$	13,342		Libor + Margin	Various during 2020 - 2021

Long-term debt
Notes payable to Bank of Taiwan	$	4,143		$	4,242		Variable, 1.3% base	June-33
Notes payable to Bank of China Trust Company		3,375			-		Taibor 3 month rate + 0.5%	December-21
Notes payable to Bank of China Trust Company		16,065			19,212		Taibor 3 month rate + 0.5%	May-24
Notes payable to E Sun Bank		3,375			-		1-M deposit rate plus 0.08%	December-22
Term loan and revolver		271,000			75,187		Libor plus margin	May-23
Total long-term debt		297,958			98,641
Less: Current portion of long-term debt		(13,052	)		(33,105	)
Less: Unamortized debt costs		(2,635	)		(1,135	)
Total long-term debt, net of current portion	$	282,271		$	64,401

Commitments and Contingencies

6 Months Ended

Jun. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 9 – Commitments and Contingencies

Purchase commitments – As of June 30, 2020, we had approximately $26.8 million in non-cancelable purchase contracts related to capital expenditures, primarily related to our manufacturing facilities in Asia. As of June 30, 2020, we also had a commitment to purchase approximately $29.8 million of wafers to be used in our manufacturing process. These wafer purchases will occur during 2020.

Defined Benefit Plan - We have a contributory defined benefit plan that covers certain employees in the United Kingdom. As of June 30, 2020, the unfunded liability for this defined benefit plan was approximately $28.7 million. An actuarial valuation was performed as of March 31, 2019, resulting in a deficit of approximately GBP 26.7 million (approximately $27.9 million based on a GBP: USD exchange rate of 1.2:1). As a result of this valuation we have agreed to a revised schedule of contributions of GBP 2.0 million (approximately $2.4 million based on a GBP: USD exchange rate of 1.2:1) to be paid in annual installments with

effect from April 1, 2020 to address the deficit revealed by the valuation (with the first payment made by March 31, 2021, and payments to be made by December 31 each year thereafter). These contributions, together with the assumed asset outperformance, are expected to eliminate the deficit by December 31, 2028. Further, we will pay GBP 0.2 million in annual installments effective April 1, 2020 to cover expenses.

Contingencies – From time to time, we are involved in various legal proceedings that arise in the normal course of business. While we intend to defend any lawsuit vigorously, we presently believe that the ultimate outcome of any pending legal proceeding will not have any material adverse effect on our consolidated financial position, cash flows or operating results. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. An unfavorable ruling could include monetary damages, which could impact our business and operating results for the period in which the ruling occurs or future periods. Based on information available, we evaluate the likelihood of potential outcomes of all pending disputes. We record an appropriate liability when the amount of any liability associated with a pending dispute is deemed probable and reasonably estimable. In addition, we do not accrue for estimated legal fees and other directly related costs as they are expensed as incurred. The Company is not currently a party to any pending litigation that the Company considers material.

Derivative Financial Instruments

6 Months Ended

Jun. 30, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 10 – Derivative Financial Instruments

We use derivative instruments to manage risks related to foreign currencies, interest rates and the net investment risk in our foreign subsidiaries. Our objectives for holding derivatives include reducing, eliminating, and efficiently managing the economic impact of these exposures as effectively as possible. Our derivative programs include strategies that both qualify and do not qualify for hedge accounting treatment.

Hedges of Foreign Currency Risk - We are exposed to fluctuations in various foreign currencies against our different functional currencies. We use foreign currency forward agreements to manage this exposure. At June 30, 2020, and December 31, 2019, we had $93.0 million and $105.9 million, respectively, outstanding foreign currency forward contracts that are intended to preserve the economic value of foreign currency denominated monetary assets and liabilities; these instruments are not designated for hedge accounting treatment in accordance with ASC No. 815. The fair value of these instruments approximates zero.

Hedges of Interest Rate and Net Investment Risk -The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps, including interest rate collars, as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The table below sets forth the fair value of the Company’s interest rate related derivative financial instruments as well as their classification on our condensed consolidated balance sheets as of June 30, 2020 and December 31, 2019:

	Other Current Assets				Other Assets				Other Current Liabilities				Other Liabilities
	2020		2019		2020		2019		2020		2019		2020		2019
Interest rate swaps and collars	$	-	$	194		-	$	36	$	2,008	$	51	$	610	$	127

The tables below set forth the effect of the Company’s derivative financial instruments on our condensed consolidated statements of income for the three and six months ended June 30, 2020 and 2019:

	Amount of Gain or (Loss) Recognized in OCI on Derivative						Location of Gain or (Loss) Reclassified from Accumulated OCI into Income	Amount of Gain or (Loss) Reclassified from Accumulated OCI into Net Income					Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivative Instruments Designated as Hedging Instruments	Amount of Gain or (Loss) Recognized in OCI on Derivative
	June 30,							June 30,						June 30,
	2020			2019				2020			2019			2020		2019
Three Months Ended
Interest rate swaps and collars	$	(180	)	$	(1,920	)	Interest expense	$	(2	)	$	456	N/A	$	-	$	-
Cross currency swaps	$	-		$	2,052		N/A	$	-		$	-	Interest income	$	-	$	233
Six Months Ended
Interest rate swaps and collars	$	(1,571	)	$	(3,010	)	Interest expense	$	(73	)	$	925	N/A		-		-
Cross currency swaps	$	-		$	(298	)	N/A		-			-	Interest income	$	-	$	688

We estimate that $0.6 million of net derivative gains included in accumulated other comprehensive income (“AOCI”) as of June 30, 2020 will be reclassified into expense within the following 12 months. No gains or losses were reclassified from AOCI into earnings as a result of forecasted transactions that failed to occur during three and six months ended June 30, 2020 or 2019.

	Amount of Gain or (Loss) Recognized in Net Income						Location of Gain or (Loss) Recognized in Net Income

Derivative Instruments Not Designated as Hedging Instruments
	June 30,
	2020			2019
Three Months Ended
Foreign currency forward contracts	$	(391	)	$	1,660		Foreign currency loss, net
Six Months Ended
Foreign currency forward contracts	$	(2,538	)	$	(1,230	)	Foreign currency loss, net

As of June 30, 2020 and December 31, 2019, the Company had not posted any collateral related to these agreements.

Leases

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Leases

NOTE 11 – Leases

The Company leases certain assets used in its business, including land, buildings and equipment. These leased assets are used for operational and administrative purposes.

The components of lease expense are set forth in the table below:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019

Operating lease expense	$	3,669	$	3,773	$	7,399	$	7,477
Finance lease expense:
Amortization of assets		209		245		418		489
Interest on lease liabilities		6		13		13		28
Short-term lease expense		122		98		216		134
Variable lease expense		738		802		1,449		1,420
Total lease expense	$	4,744	$	4,931	$	9,495	$	9,548

The table below sets forth supplemental balance sheet information related to leases. In our condensed consolidated balance sheets, ROU assets are included in other long-term assets while lease liabilities are located in accrued liabilities and other for the current portion and other long-term liabilities for the non-current portion:

	June 30, 2020	December 31, 2019
Operating leases:
Operating lease ROU assets	$51,739	$57,427

Current operating lease liabilities	11,417	12,554
Noncurrent operating lease liabilities	22,933	27,545
Total operating lease liabilities	$34,350	$40,099

Finance leases:
Finance lease ROU assets	$2,507	$3,396
Accumulated amortization	(1,880)	(1,924)
Finance lease ROU assets, net	$627	$1,472

Current finance lease liabilities	$593	$903
Non-current finance lease liabilities	–	138
Total finance lease liabilities	$593	$1,041

Weighted average remaining lease term (in years):
Operating leases	4.2	4.4
Finance leases	0.8	1.3

Weighted average discount rate:
Operating leases	3.9%	3.8%
Finance leases	3.0%	3.0%

The table below sets forth supplemental cash flow and other information related to leases:

	Six Months Ended	Six Months Ended
	June 30, 2020	June 30, 2019
Cash paid for the amounts included in the measurements of lease liabilities:
Operating cash outflows from operating leases	$9,753	$10,154
Operating cash outflows from finance leases	13	28
Financing cash outflow from finance leases	445	588

ROU assets obtained in exchange for lease liabilities incurred:
Operating leases	532	3,198

The table below sets forth information about lease liability maturities:

	June 30, 2020
	Operating Leases		Finance Leases
Remainder of 2020	$	6,955	$	461
2021		10,150		139
2022		8,371		-
2023		4,501		-
2024		2,382		-
2025		2,288		-
2026 and thereafter		2,578	-
Total lease payments		37,225		600
Less: imputed interest		(2,875)		(7)
Total lease obligations		34,350		593
Less: current obligations		(11,417)		(593)
Long-term lease obligations	$	22,933	$	0

Employee Benefit Plans

6 Months Ended

Jun. 30, 2020

Compensation And Retirement Disclosure [Abstract]

Employee Benefit Plans

NOTE 12 – Employee Benefit Plans

We maintain a Non-Qualified Deferred Compensation Plan (the “Deferred Compensation Plan”) for executive officers, key employees and members of the Board of Directors. The Deferred Compensation Plan allows eligible participants to defer the receipt of eligible compensation, including equity awards, until designated future dates. We offset our obligations under the Deferred Compensation Plan primarily by investing in the actual underlying investments. At June 30, 2020 and December 31, 2019, these investments totaled approximately $11.2 million and $12.9 million, respectively.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Related Parties

6 Months Ended

Jun. 30, 2020

Related Parties

NOTE 13 – Related Parties

We conduct business with a related party company, Lite-On Semiconductor Corporation and its subsidiaries and affiliates (collectively, “LSC”), and Nuvoton Technology Corporation and its subsidiaries and affiliates (collectively, “Nuvoton”). LSC is our largest stockholder, owning approximately 15% of our outstanding Common Stock as of June 30, 2020, and is a member of the Lite-On Group of companies. On August 8, 2019, we announced that we entered into an agreement with LSC pursuant to which the Company shall acquire LSC. The aggregate consideration payable by the Company, based on the December 31, 2019 exchange rate, is approximately $437 million. This amount is subject to change, based on the Taiwan dollar to United States dollar exchange rate at closing. The acquisition received LSC stockholder approval on October 25, 2019, and we anticipate completing the acquisition in the second half of 2020, subject to customary closing conditions and pending regulatory approval in China. We expect to fund the purchase price of the transaction primarily with proceeds from the Credit Agreement. See Note 8. Raymond Soong, the former Chairman of our Board of Directors, is the Chairman of LSC, and is the Chairman of Lite-On Technology Corporation (“LTC”), a significant shareholder of LSC. C.H. Chen, our former President and Chief Executive Officer and currently the Vice Chairman of our Board of Directors, is also Vice Chairman of LSC and a board member of LTC. Dr. Keh-Shew Lu, Chairman of our Board of Directors, President and Chief Executive Officer, is a board member of LTC, and a board member of Nuvoton. We consider our relationships with LSC and Nuvoton to be mutually beneficial, and we plan to continue our strategic alliance with LSC and Nuvoton. We purchase wafers from Nuvoton for use in our production process.

We also conduct business with Keylink International (B.V.I.) Inc. and its subsidiaries and affiliates (collectively, “Keylink”). Keylink is our 5% joint venture partner in our Shanghai assembly and test facilities. We sell products to, and purchase inventory from Keylink. In addition, our subsidiaries in China lease their manufacturing facilities in Shanghai from, and subcontract a portion of our

manufacturing process (metal plating and environmental services) to, Keylink. We also pay fees for plating and rental services and consulting to Keylink. The aggregate amounts paid to Keylink for the three months ended June 30, 2020 and 2019 were approximately $3.8 million and $3.9 million, respectively. The aggregate amounts paid to Keylink for the six months ended June 30, 2020 and 2019 were approximately $6.9 million and $7.8 million, respectively. In addition, Chengdu Ya Guang Electronic Company Limited (“Ya Guang”) is our 2% joint venture partner in one of our Chengdu assembly and test facilities and is our 5% joint venture partner in our other Chengdu assembly and test facility; however, we have no material transactions with Ya Guang. We also purchase materials from Jiyuan Crystal Photoelectric Frequency Technology Ltd (“JCP”), a frequency control product manufacturing company in which we have made an equity investment and account for that investment using the equity method of accounting.

The Audit Committee of the Board reviews all related party transactions for potential conflict of interest situations on an ongoing basis, all in accordance with such procedures as the Audit Committee may adopt from time to time.

The table below sets forth net sales to and purchases from related parties:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
LSC
Net sales	$	171	$	268	$	299	$	456
Purchases	$	3,806	$	4,079	$	6,554	$	8,491
Nuvoton
Purchases	$	2,011	$	2,034	$	3,655	$	3,301
Keylink
Net sales	$	4,975	$	3,566	$	8,960	$	6,381
Purchases	$	426	$	585	$	831	$	1,190
JCP
Purchases	$	291	$	151	$	447	$	311

The table below sets forth accounts receivable from, and accounts payable to, related parties:

	June 30,		December 31,
	2020		2019
LSC
Accounts receivable	$	171	$	184
Accounts payable	$	2,799	$	2,154
Nuvoton
Accounts payable	$	1,071	$	1,055
Keylink
Accounts receivable	$	36,960	$	31,598
Accounts payable	$	32,029	$	28,244
JCP
Accounts payable	$	326	$	173

Acquisitions

6 Months Ended

Jun. 30, 2020

Business Combinations [Abstract]

Acquisitions

Note 14 –Acquisitions

Savitech Acquisition

On February 5, 2020, the Company entered into an agreement to invest up to approximately $14.2 million to acquire at least 51% of Savitech Corporation (“Savitech”), a fabless semiconductor design company located in Zhubei City, Taiwan. The Company will make the investment in two tranches. The first tranche of $5.6 million, which provided the Company with a 33.6% ownership of Savitech, was made on March 4, 2020. The initial tranche was funded with cash on hand. The second tranche, currently recorded in other long-term liabilities, as shown in the table below, and currently valued at $8.4 million will increase the Company’s ownership to at least 51% of Savitech. The second tranche will be paid on June 30, 2021, provided Savitech achieves previously agreed-to revenue levels. If revenue levels are not achieved the Company will pay less than the maximum $8.6 million, but regardless of the amount paid for the second tranche, the Company will still acquire at least 51% of Savitech.

The Company recorded the purchase of Savitech as a business acquisition and will consolidate Savitech into its operations, based on the voting model, with a non-controlling interest related to the interest the Company does not own in Savitech. The Company made its investment in Savitech in order to increase the Company’s integrated circuit business. Total purchase consideration recorded was $13.9 million. The goodwill will not be tax deductible. The Company also incurred acquisition costs of approximately $0.1 million that were recognized in selling, general and administrative expense. The table below sets forth the fair value of the assets and liabilities recorded in the acquisition and the corresponding line item in which the item is recorded in our condensed consolidated balance sheet at the date of acquisition. The acquisition accounting is not final as deferred taxes, the contingent consideration payment and goodwill are being finalized. We expect the acquisition accounting to be finalized in the third quarter of 2020.

Cash and cash equivalents	$	6.2
Prepaid expenses and other		0.7
Goodwill		12.7
Intangible assets, net		6.1
Other long-term assets		0.3
Accrued liabilities and other		9.2
Noncontrolling interest		11.7

Wafer Fabrication Facility Acquisition

On April 1, 2019, the Company completed the previously announced acquisition of a wafer fabrication facility located in Greenock, Scotland (“GFAB”). The Company recorded the purchase of GFAB as a business acquisition. The Company purchased GFAB in order to increase the Company’s wafer production capacity. Total consideration paid by the Company was $33.2 million and was funded by advances under the revolving portion of our long-term credit facility. The facility and assets were wholly acquired, and there is no remaining minority interest. The goodwill will not be tax deductible. The Company also incurred acquisition costs of approximately $0.6 million that were recognized in selling, general and administrative expense. Due to a lack of available data we are unable to provide historical financial pro forma data. The table below sets forth the fair value of the assets and liabilities recorded in the GFAB acquisition and the corresponding line item in which the item is recorded in our condensed consolidated balance sheet.

Property, plant and equipment, net	$	24.4
Inventories		3.6
Prepaid expenses and other		5.2
Goodwill		0.9
Deferred tax liabilities			1.0

Summary of Operations and Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Summary of Operations	Summary of Operations Diodes Incorporated, together with its subsidiaries (collectively, the “Company,” “we” or “our”) (Nasdaq: DIOD), is a leading global manufacturer and supplier of high-quality, application-specific standard products within the broad discrete, logic, analog and mixed-signal semiconductor markets. We serve the consumer electronics, computing, communications, industrial, and automotive markets. Our products include diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. We also have timing, connectivity, switching, and signal integrity solutions for high-speed signals. Our corporate headquarters and Americas’ sales offices are located in Plano, Texas and Milpitas, California. Design, marketing, and engineering centers are located in Plano; Milpitas; Taipei, Taoyuan City and Zhubei City, Taiwan; Oldham, England; and Neuhaus, Germany. Our wafer fabrication facilities are located in Oldham and Shanghai, China and Greenock, Scotland. We have assembly and test facilities located in Shanghai, Jinan and Chengdu, China, as well as in Hong Kong, Neuhaus and Taipei. Additional engineering, research and development, sales, warehouse, and logistics offices are located in Taipei; Hong Kong; Oldham; Shanghai; Shenzhen and Yangzhou, China; Seongnam-si, South Korea; Munich, Germany; and Tokyo, Japan, with support offices throughout the world.
Basis of Presentation	Basis of Presentation The condensed consolidated financial data at December 31, 2019 is derived from audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2019 filed with the Securities and Exchange Commission (“SEC”) on February 12, 2020 (“Form 10-K”). The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States Generally Accepted Accounting Principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q. They do not include all information and footnotes necessary for a fair presentation of financial position, operating results and cash flows in conformity with GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in our Form 10-K. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the operating results for the period presented have been included in the interim period. Operating results for the three and six months ended June 30, 2020 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2020. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates. As permitted under GAAP, interim accounting for certain expenses, including income taxes, are based on full year forecasts. For interim financial reporting purposes, income taxes are recorded based upon estimated annual effective income tax rates taking into consideration discrete items occurring in a quarter. Dollar amounts and share amounts are presented in thousands, except per share amounts, unless otherwise noted. Certain prior year’s balances may have been reclassified to conform to the current financial statement presentation.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In March 2020, the Financial Accounting Standards Board issued Accounting Standards (“FASB”) Update (“ASU”) No. 2020-04 Reference Rate Reform (Topic 848). ASU No. 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU No. 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the second quarter of 2020; the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur. In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, which requires measurement and recognition of expected credit losses for financial assets held. We adopted ASU No. 2016-13 effective January 1, 2020. The adoption of ASU No. 2016-13 did not have a material impact on our consolidated financial statements and related disclosures.

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The table below sets forth the reconciliation between net income and the weighted average shares outstanding used for calculating basic and diluted EPS:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Earnings (numerator)
Net income attributable to common stockholders	$	21,033	$	36,284	$	41,201	$	68,000

Shares (denominator)
Weighted average common shares outstanding (basic)		51,527		50,658		51,431		50,529
Dilutive effect of stock options and stock awards outstanding		1,042		962		1,086		1,037
Adjusted weighted average common shares outstanding (diluted)		52,569		51,620		52,517		51,566

Earnings per share attributable to common stockholders
Basic	$	0.41	$	0.72	$	0.80	$	1.35
Diluted	$	0.40	$	0.70	$	0.78	$	1.32

Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive		8		131		3		95

Inventories (Tables)

6 Months Ended

Jun. 30, 2020

Inventory Disclosure [Abstract]

Schedule of Inventory Current

The table below sets forth inventories which are stated at the lower of cost or net realizable value:

	June 30, 2020		December 31, 2019
Finished goods	$	69,174	$	62,900
Work-in-progress		53,457		55,082
Raw materials		133,197		118,490
Total	$	255,828	$	236,472

Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Goodwill

The table below sets forth the changes in goodwill:

Balance at December 31, 2019	$	141,318
Savitech acquisition (see Note 14 for additional information)		12,702
Foreign currency translation adjustment		(1,880	)
Balance at June 30, 2020	$	152,140

Schedule of Intangible Assets Other Than Goodwill

The table below sets forth the value of intangible assets, other than goodwill:

	June 30,			December 31,
	2020			2019
Intangible assets subject to amortization:
Gross carrying amount	$	249,647		$	239,975
Accumulated amortization		(132,693	)		(124,452	)
Foreign currency translation adjustment		(8,110	)		(9,842	)
Total		108,844			105,681
Intangible assets with indefinite lives:
Gross carrying amount		10,412			14,883
Foreign currency translation adjustment		(1,180	)		(1,041	)
Total		9,232			13,842
Total intangible assets, net	$	118,076		$	119,523

Schedule of Amortization Expense Related to Intangible Assets

The table below sets forth amortization expense related to intangible assets subject to amortization:

Amortization expense	2020		2019
Three months ended June 30,	$	4,021	$	4,536
Six months ended June 30,	$	8,242	$	9,020

Income Tax Provision (Tables)

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Schedule of Information Related to Income Tax Expense

The table below sets forth information related to our income tax expense:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2020			2019			2020			2019
Domestic pre-tax income	$	7,707		$	8,064		$	12,975		$	20,550
Foreign pre-tax income	$	18,351		$	39,813		$	38,039		$	69,361
Income tax provision	$	4,670		$	11,174		$	9,226		$	21,472
Effective tax rate		17.9	%		23.3	%		18.1	%		23.9	%
Impact of tax holidays on tax expense	$	(241	)	$	572		$	(1,315	)	$	849
Earnings per share impact of tax holidays:
Basic	$	0.01		$	(0.01	)	$	0.03		$	(0.02	)
Diluted	$	0.01		$	(0.01	)	$	0.03		$	(0.02	)

Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Share Based Compensation [Abstract]

Schedule of Share-Based Compensation Expense

The table below sets forth the line items where share-based compensation expense was recorded:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Cost of goods sold	$	257	$	259	$	530	$	384
Selling, general and administrative		6,715		4,309		10,426		7,946
Research and development		729		730		1,438		1,445
Total share-based compensation expense	$	7,701	$	5,298	$	12,394	$	9,775

Segment Information and Net Sales (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Schedule of Net Sales from Based on Location of the Subsidiary

The tables below set forth net sales based on the location of the subsidiary producing the net sale.

Three Months Ended June 30, 2020	Asia			North America			Europe			Consolidated
Total sales	$	323,439		$	190,543		$	53,785		$	567,767
Intercompany elimination		(133,552	)		(121,545	)		(24,001	)		(279,098	)
Net sales	$	189,887		$	68,998		$	29,784		$	288,669


Three Months Ended June 30, 2019	Asia			North America			Europe			Consolidated
Total sales	$	319,740		$	173,694		$	66,124		$	559,558
Intercompany elimination		(116,105	)		(94,278	)		(27,169	)		(237,552	)
Net sales	$	203,635		$	79,416		$	38,955		$	322,006

As of and for the
Six Months Ended June 30, 2020	Asia			North America			Europe			Consolidated
Total sales	$	625,302		$	358,715		$	112,786		$	1,096,803
Intercompany elimination		(250,473	)		(226,009	)		(50,935	)		(527,417	)
Net sales	$	374,829		$	132,706		$	61,851		$	569,386

Property, plant and equipment, net	$	355,704		$	24,435		$	70,476		$	450,615
Total assets	$	1,494,605		$	230,888		$	211,670		$	1,937,163

As of and for the
Six Months Ended June 30, 2019	Asia			North America			Europe			Consolidated
Total sales	$	593,640		$	274,974		$	117,176		$	985,790
Intercompany elimination		(189,702	)		(132,194	)		(39,595	)		(361,491	)
Net sales	$	403,938		$	142,780		$	77,581		$	624,299

Property, plant and equipment, net	$	399,378		$	22,450		$	48,862		$	470,690
Total assets	$	1,190,443		$	235,248		$	188,468		$	1,614,159

Schedule of Net Sales by Direct Sales or Distributor and Location

	Three Months Ended
	June 30,
Net Sales by Region	2020		2019
Asia	$	223,056	$	239,082
Europe		43,145		46,050
Americas		22,468		36,874
Total net sales	$	288,669	$	322,006

Net Sales by Type
Direct sales	$	92,671	$	108,931
Distributor sales		195,998		213,075
Total net sales	$	288,669	$	322,006

	Six Months Ended
	June 30,
Net Sales by Region	2020		2019
Asia	$	433,861	$	463,371
Europe		90,076		84,444
Americas		45,449		76,484
Total net sales	$	569,386	$	624,299

Net Sales by Type
Direct sales	$	280,581	$	195,289
Distributor sales		288,805		429,010
Total net sales	$	569,386	$	624,299

Debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Debt

Borrowings outstanding as of June 30, 2020 and December 31, 2019, are set forth in the table below:

	June 30,			December 31,				Current Amount
Description	2020			2019			Interest Rate	Maturity
Short-term debt	$	63,668		$	13,342		Libor + Margin	Various during 2020 - 2021

Long-term debt
Notes payable to Bank of Taiwan	$	4,143		$	4,242		Variable, 1.3% base	June-33
Notes payable to Bank of China Trust Company		3,375			-		Taibor 3 month rate + 0.5%	December-21
Notes payable to Bank of China Trust Company		16,065			19,212		Taibor 3 month rate + 0.5%	May-24
Notes payable to E Sun Bank		3,375			-		1-M deposit rate plus 0.08%	December-22
Term loan and revolver		271,000			75,187		Libor plus margin	May-23
Total long-term debt		297,958			98,641
Less: Current portion of long-term debt		(13,052	)		(33,105	)
Less: Unamortized debt costs		(2,635	)		(1,135	)
Total long-term debt, net of current portion	$	282,271		$	64,401

Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Summary of Fair Value of Interest Rate Related Derivative Financial Instruments and Their Classification on Our Condensed Consolidated Balance Sheets

	Other Current Assets				Other Assets				Other Current Liabilities				Other Liabilities
	2020		2019		2020		2019		2020		2019		2020		2019
Interest rate swaps and collars	$	-	$	194		-	$	36	$	2,008	$	51	$	610	$	127

Summary of Effect of Derivative Financial Instruments on Our Condensed Consolidated Statements of Operations

The tables below set forth the effect of the Company’s derivative financial instruments on our condensed consolidated statements of income for the three and six months ended June 30, 2020 and 2019:

	Amount of Gain or (Loss) Recognized in OCI on Derivative						Location of Gain or (Loss) Reclassified from Accumulated OCI into Income	Amount of Gain or (Loss) Reclassified from Accumulated OCI into Net Income					Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivative Instruments Designated as Hedging Instruments	Amount of Gain or (Loss) Recognized in OCI on Derivative
	June 30,							June 30,						June 30,
	2020			2019				2020			2019			2020		2019
Three Months Ended
Interest rate swaps and collars	$	(180	)	$	(1,920	)	Interest expense	$	(2	)	$	456	N/A	$	-	$	-
Cross currency swaps	$	-		$	2,052		N/A	$	-		$	-	Interest income	$	-	$	233
Six Months Ended
Interest rate swaps and collars	$	(1,571	)	$	(3,010	)	Interest expense	$	(73	)	$	925	N/A		-		-
Cross currency swaps	$	-		$	(298	)	N/A		-			-	Interest income	$	-	$	688

	Amount of Gain or (Loss) Recognized in Net Income						Location of Gain or (Loss) Recognized in Net Income

Derivative Instruments Not Designated as Hedging Instruments
	June 30,
	2020			2019
Three Months Ended
Foreign currency forward contracts	$	(391	)	$	1,660		Foreign currency loss, net
Six Months Ended
Foreign currency forward contracts	$	(2,538	)	$	(1,230	)	Foreign currency loss, net

Leases (Tables)

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Components of Lease Expense

The components of lease expense are set forth in the table below:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019

Operating lease expense	$	3,669	$	3,773	$	7,399	$	7,477
Finance lease expense:
Amortization of assets		209		245		418		489
Interest on lease liabilities		6		13		13		28
Short-term lease expense		122		98		216		134
Variable lease expense		738		802		1,449		1,420
Total lease expense	$	4,744	$	4,931	$	9,495	$	9,548

Supplemental Balance Sheet Information Related to Leases

	June 30, 2020	December 31, 2019
Operating leases:
Operating lease ROU assets	$51,739	$57,427

Current operating lease liabilities	11,417	12,554
Noncurrent operating lease liabilities	22,933	27,545
Total operating lease liabilities	$34,350	$40,099

Finance leases:
Finance lease ROU assets	$2,507	$3,396
Accumulated amortization	(1,880)	(1,924)
Finance lease ROU assets, net	$627	$1,472

Current finance lease liabilities	$593	$903
Non-current finance lease liabilities	–	138
Total finance lease liabilities	$593	$1,041

Weighted average remaining lease term (in years):
Operating leases	4.2	4.4
Finance leases	0.8	1.3

Weighted average discount rate:
Operating leases	3.9%	3.8%
Finance leases	3.0%	3.0%

Supplemental Cash Flow and Other Information Related to Leases

The table below sets forth supplemental cash flow and other information related to leases:

	Six Months Ended	Six Months Ended
	June 30, 2020	June 30, 2019
Cash paid for the amounts included in the measurements of lease liabilities:
Operating cash outflows from operating leases	$9,753	$10,154
Operating cash outflows from finance leases	13	28
Financing cash outflow from finance leases	445	588

ROU assets obtained in exchange for lease liabilities incurred:
Operating leases	532	3,198

Schedule of Operating and Finance Lease Liability Maturities

The table below sets forth information about lease liability maturities:

	June 30, 2020
	Operating Leases		Finance Leases
Remainder of 2020	$	6,955	$	461
2021		10,150		139
2022		8,371		-
2023		4,501		-
2024		2,382		-
2025		2,288		-
2026 and thereafter		2,578	-
Total lease payments		37,225		600
Less: imputed interest		(2,875)		(7)
Total lease obligations		34,350		593
Less: current obligations		(11,417)		(593)
Long-term lease obligations	$	22,933	$	0

Related Parties (Tables)

6 Months Ended

Jun. 30, 2020

Schedule of Net Sales and Purchases of Related Party Transactions

The table below sets forth net sales to and purchases from related parties:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
LSC
Net sales	$	171	$	268	$	299	$	456
Purchases	$	3,806	$	4,079	$	6,554	$	8,491
Nuvoton
Purchases	$	2,011	$	2,034	$	3,655	$	3,301
Keylink
Net sales	$	4,975	$	3,566	$	8,960	$	6,381
Purchases	$	426	$	585	$	831	$	1,190
JCP
Purchases	$	291	$	151	$	447	$	311

Schedule of Account Receivable and Payable of Related Party Transactions

The table below sets forth accounts receivable from, and accounts payable to, related parties:

	June 30,		December 31,
	2020		2019
LSC
Accounts receivable	$	171	$	184
Accounts payable	$	2,799	$	2,154
Nuvoton
Accounts payable	$	1,071	$	1,055
Keylink
Accounts receivable	$	36,960	$	31,598
Accounts payable	$	32,029	$	28,244
JCP
Accounts payable	$	326	$	173

Acquisitions (Tables)

6 Months Ended

Jun. 30, 2020

Savitech Acquisition

Summary of Fair Value of Assets and Liabilities Related to Acquisition Recorded in Condensed Consolidated Balance Sheet

The table below sets forth the fair value of the assets and liabilities recorded in the acquisition and the corresponding line item in which the item is recorded in our condensed consolidated balance sheet at the date of acquisition.

Cash and cash equivalents	$	6.2
Prepaid expenses and other		0.7
Goodwill		12.7
Intangible assets, net		6.1
Other long-term assets		0.3
Accrued liabilities and other		9.2
Noncontrolling interest		11.7

Wafer Fabrication Facility ("GFAB")

Summary of Fair Value of Assets and Liabilities Related to Acquisition Recorded in Condensed Consolidated Balance Sheet

The table below sets forth the fair value of the assets and liabilities recorded in the GFAB acquisition and the corresponding line item in which the item is recorded in our condensed consolidated balance sheet.

Property, plant and equipment, net	$	24.4
Inventories		3.6
Prepaid expenses and other		5.2
Goodwill		0.9
Deferred tax liabilities			1.0

Earnings Per Share - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings per share reconciliation disclosure			Earnings per share (“EPS”) is calculated by dividing net income attributable to common stockholders by the weighted-average number of shares of Common Stock outstanding during the period. Diluted EPS is calculated similarly but includes potential dilution from the exercise of stock options and stock awards, except when the effect would be anti-dilutive.
Common stock dividends paid	$ 0	$ 0	$ 0	$ 0

Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings (numerator)
Net income attributable to common stockholders	$ 21,033	$ 36,284	$ 41,201	$ 68,000
Shares (denominator)
Weighted average common shares outstanding (basic)	51,527	50,658	51,431	50,529
Dilutive effect of stock options and stock awards outstanding	1,042	962	1,086	1,037
Adjusted weighted average common shares outstanding (diluted)	52,569	51,620	52,517	51,566
Earnings per share attributable to common stockholders
Basic	$ 0.41	$ 0.72	$ 0.80	$ 1.35
Diluted	$ 0.40	$ 0.70	$ 0.78	$ 1.32
Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive	8	131	3	95

Inventories - Schedule of Inventory Current (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Finished goods	$ 69,174	$ 62,900
Work-in-progress	53,457	55,082
Raw materials	133,197	118,490
Total	$ 255,828	$ 236,472

Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill
Goodwill beginning balance	$ 141,318
Foreign currency translation adjustment	(1,880)
Goodwill ending balance	152,140
Savitech Acquisition
Goodwill
Acquisitions	$ 12,702

Goodwill and Intangible Assets - Schedule of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Intangible assets subject to amortization
Gross carrying amount	$ 249,647	$ 239,975
Accumulated amortization	(132,693)	(124,452)
Foreign currency translation adjustment	(8,110)	(9,842)
Total	108,844	105,681
Intangible assets with indefinite lives
Gross carrying amount	10,412	14,883
Foreign currency translation adjustment	(1,180)	(1,041)
Total	9,232	13,842
Total intangible assets, net	$ 118,076	$ 119,523

Goodwill and Intangible Assets - Schedule of Amortization Expense Related to Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 4,021	$ 4,536	$ 8,242	$ 9,020

Income Tax Provision - Schedule of Information Related to Income Tax Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Domestic pre-tax income	$ 7,707	$ 8,064	$ 12,975	$ 20,550
Foreign pre-tax income	18,351	39,813	38,039	69,361
Income tax provision	$ 4,670	$ 11,174	$ 9,226	$ 21,472
Effective tax rate	17.90%	23.30%	18.10%	23.90%
Impact of tax holidays on tax expense	$ (241)	$ 572	$ (1,315)	$ 849
Earnings per share impact of tax holidays:
Basic	$ 0.01	$ (0.01)	$ 0.03	$ (0.02)
Diluted	$ 0.01	$ (0.01)	$ 0.03	$ (0.02)

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Income Tax Provision - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 39.6
Income tax examination, description	We file income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. We are no longer subject to U.S. federal income tax examinations by tax authorities for tax years before 2012, or for the 2015 tax year. We are no longer subject to China income tax examinations by tax authorities for tax years before 2010. With respect to state and local jurisdictions and countries outside of the U.S. (other than China), with limited exceptions, the Company is no longer subject to income tax audits for years before 2014. Although the outcome of tax audits is always uncertain, the Company believes that adequate amounts of tax, interest and penalties, if any, have been provided for in the Company’s reserve for any adjustments that may result from currently pending tax audits. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in interest expense.
Significant change in unrecognized tax benefits, nature of event	It is reasonably possible that the amount of the unrecognized benefit with respect to certain of the Company’s unrecognized tax positions will significantly increase or decrease within the next 12 months.
Significant change in unrecognized tax benefits is reasonably possible, estimated range not possible	At this time, an estimate of the range of the reasonably possible outcomes cannot be made.

Share-Based Compensation - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash proceeds received from stock option exercises		$ 1.1
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		2 years 1 month 6 days
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized	$ 43.5	$ 43.5
Restricted Stock Awards and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		4 years
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		4 years
Additional expense resulting from modification	$ 1.7
Restricted Stock Awards and Restricted Stock Units \| 2001 Omnibus Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award granted in period \| shares		0
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		3 years

Share-Based Compensation - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 7,701	$ 5,298	$ 12,394	$ 9,775
Cost of Goods Sold
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	257	259	530	384
Selling, General and Administrative Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	6,715	4,309	10,426	7,946
Research and Development Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 729	$ 730	$ 1,438	$ 1,445

Segment Information and Net Sales - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($) Customer	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019 USD ($) Customer
Entity Wide Revenue Major Customer [Line Items]
Number of customer accounted for 10% or more of our revenue \| Customer		1		1
Net sales \| $	$ 288,669	$ 322,006	$ 569,386	$ 624,299
Number of customer did not account for 10% or greater of outstanding accounts receivable \| Customer			0	0
Number of customer did not account for 10% or greater of net sales \| Customer			0	0
China
Entity Wide Revenue Major Customer [Line Items]
Net sales \| $	$ 152,400	$ 160,300	$ 291,300	$ 311,800
Geographic Concentration Risk
Entity Wide Revenue Major Customer [Line Items]
Percentage of net sales		10.00%		10.00%
Net sales \| $		$ 31,500

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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+ Details

Segment Information and Net Sales - Schedule of Net Sales From Based on Location of the Subsidiary (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 288,669	$ 322,006	$ 569,386	$ 624,299
Property, plant and equipment, net	450,615	470,690	450,615	470,690	$ 469,574
Total assets	1,937,163	1,614,159	1,937,163	1,614,159	$ 1,639,384
Operating Segments
Segment Reporting Information [Line Items]
Net sales	567,767	559,558	1,096,803	985,790
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(279,098)	(237,552)	(527,417)	(361,491)
Asia
Segment Reporting Information [Line Items]
Net sales	189,887	203,635	374,829	403,938
Property, plant and equipment, net	355,704	399,378	355,704	399,378
Total assets	1,494,605	1,190,443	1,494,605	1,190,443
Asia \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	323,439	319,740	625,302	593,640
Asia \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(133,552)	(116,105)	(250,473)	(189,702)
North America
Segment Reporting Information [Line Items]
Net sales	68,998	79,416	132,706	142,780
Property, plant and equipment, net	24,435	22,450	24,435	22,450
Total assets	230,888	235,248	230,888	235,248
North America \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	190,543	173,694	358,715	274,974
North America \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(121,545)	(94,278)	(226,009)	(132,194)
Europe
Segment Reporting Information [Line Items]
Net sales	29,784	38,955	61,851	77,581
Property, plant and equipment, net	70,476	48,862	70,476	48,862
Total assets	211,670	188,468	211,670	188,468
Europe \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	53,785	66,124	112,786	117,176
Europe \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (24,001)	$ (27,169)	$ (50,935)	$ (39,595)

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-URI http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Segment Information and Net Sales - Schedule of Net Sales by Direct Sales or Distributor and Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Revenue Reconciling Item [Line Items]
Total net sales	$ 288,669	$ 322,006	$ 569,386	$ 624,299
Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Total net sales	92,671	108,931	280,581	195,289
Distributor Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Total net sales	195,998	213,075	288,805	429,010
Asia
Segment Reporting Revenue Reconciling Item [Line Items]
Total net sales	223,056	239,082	433,861	463,371
Europe
Segment Reporting Revenue Reconciling Item [Line Items]
Total net sales	43,145	46,050	90,076	84,444
Americas
Segment Reporting Revenue Reconciling Item [Line Items]
Total net sales	$ 22,468	$ 36,874	$ 45,449	$ 76,484

- Definition

+ References

+ Details

Debt - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
Debt - Additional Information (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2020	May 29, 2020	May 28, 2020	Dec. 31, 2019
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity			$ 670,000,000	$ 500,000,000
Lines of credit unused and available					$ 101,400,000
Line of credit facility advanced under foreign credit line					63,700,000
Line of Credit Facility Credit Used For Guarantee					400,000
Short-term debt	$ 63,668,000	$ 63,668,000			13,342,000
Long term debt	$ 297,958,000	$ 297,958,000			$ 98,641,000
ERIS Technology Corporation
Line Of Credit Facility [Line Items]
Percentage of shares acquired by subsidiary in acquiree	51.00%	51.00%
Short-term debt	$ 13,700,000	$ 13,700,000
Long term debt	27,000,000.0	$ 27,000,000.0
Debt maturity period term		2020 through 2033
Credit Agreement
Line Of Credit Facility [Line Items]
Credit agreement amendment date		May 29, 2020
Credit agreement commencement date		Oct. 26, 2016
Debt extinguishment		$ 52,200,000
Loss on debt extinguishment	(700,000)
Third-party fees		$ 700,000
Financial and non-financial convenants, description		Furthermore, under the Credit Agreement, restricted payments, including dividends and share repurchases, are permitted in certain circumstances, including while the pro forma Consolidated Leverage Ratio is, both before and after giving effect to any such restricted payment, at least 0.25 to 1.00 less than the maximum permitted under the Credit Agreement.
Acquisition Draw Term Commitment
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity			340,000,000
Initial Term Commitment
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity			180,000,000
Revolver
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity			150,000,000	250,000,000
Line of credit facility, maturity date		May 29, 2023
Revolver \| Swing Line Sublimit
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity			20,000,000	10,000,000
Revolver \| Letter of Credit Sublimit
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity			10,000,000	10,000,000
Revolver \| Alternative Currency Sublimit
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity			$ 40,000,000	20,000,000
Term Loan
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity				$ 250,000,000
Line of credit facility, maturity date		May 29, 2023
Unsecured
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity	165,500,000	$ 165,500,000
Restricted cash deposits	$ 51,400,000	$ 51,400,000

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	6 Months Ended
Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Short-term debt	$ 63,668	$ 13,342
Total long-term debt	297,958	98,641
Less: Current portion of long-term debt	(13,052)	(33,105)
Less: Unamortized debt costs	(2,635)	(1,135)
Long-term debt, net of current portion	$ 282,271	64,401
Debt instrument, interest rate description	Libor + Margin
Debt Instrument, maturity date, description	Various during 2020 - 2021
Notes Payable to Bank \| Bank of Taiwan \| June-33
Debt Instrument [Line Items]
Total long-term debt	$ 4,143	4,242
Debt instrument, interest rate description	Variable, 1.3% base
Long-term variable interest rate	1.30%
Debt Instrument, maturity date, description	June-33
Notes Payable to Bank \| China Trust Bank \| December-21
Debt Instrument [Line Items]
Total long-term debt	$ 3,375
Debt instrument, interest rate description	Taibor 3 month rate + 0.5%
Debt Instrument, maturity date, description	December-21
Notes Payable to Bank \| China Trust Bank \| May-24
Debt Instrument [Line Items]
Total long-term debt	$ 16,065	19,212
Debt instrument, interest rate description	Taibor 3 month rate + 0.5%
Debt Instrument, maturity date, description	May-24
Notes Payable to Bank \| E Sun Bank \| December-22
Debt Instrument [Line Items]
Total long-term debt	$ 3,375
Debt instrument, interest rate description	1-M deposit rate plus 0.08%
Debt Instrument, maturity date, description	December-22
Term Loan and Revolver
Debt Instrument [Line Items]
Total long-term debt	$ 271,000	$ 75,187
Debt instrument, interest rate description	Libor plus margin
Debt Instrument, maturity date, description	May-23

Commitments and Contingencies - Additional Information (Details) £ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) $ / £	Jun. 30, 2020 GBP (£) $ / £	Mar. 31, 2019 USD ($) $ / £	Mar. 31, 2019 GBP (£) $ / £
Commitments And Contingencies Disclosure [Abstract]
Purchase Commitments	$ 26.8
Long-term purchase commitment, Amount	$ 29.8
Defined benefit plan, estimated future employer contributions in current fiscal year, description	We have a contributory defined benefit plan that covers certain employees in the United Kingdom. As of June 30, 2020, the unfunded liability for this defined benefit plan was approximately $28.7 million. An actuarial valuation was performed as of March 31, 2019, resulting in a deficit of approximately GBP 26.7 million (approximately $27.9 million based on a GBP: USD exchange rate of 1.2:1). As a result of this valuation we have agreed to a revised schedule of contributions of GBP 2.0 million (approximately $2.4 million based on a GBP: USD exchange rate of 1.2:1) to be paid in annual installments with effect from April 1, 2020 to address the deficit revealed by the valuation (with the first payment made by March 31, 2021, and payments to be made by December 31 each year thereafter). These contributions, together with the assumed asset outperformance, are expected to eliminate the deficit by December 31, 2028. Further, we will pay GBP 0.2 million in annual installments effective April 1, 2020 to cover expenses.
Defined benefit plan, annual future benefit payments	$ 2.4	£ 2.0
Unfunded liability of defined benefit plan, deficit			$ 27.9	£ 26.7
Defined benefit plan, additional annual future benefit payments \| £		£ 0.2
GBP:USD exchange rate \| $ / £	1.2	1.2	1.2	1.2
Unfunded liability of defined benefit plan	$ 28.7

Derivative Financial Instruments - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Objectives for using derivative instruments	The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps, including interest rate collars, as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.
Net derivative gain will be reclassified from AOCI into net income	$ 600,000
Posted collateral related to agreements	0	$ 0
Foreign Currency Forward Contracts
Derivative [Line Items]
Fair value of foreign exchange hedges	0
Fair value of foreign currency derivative instruments not designated as hedging	$ 93,000,000.0	$ 105,900,000

- Definition

Description of the reasons for holding or issuing derivative instruments and nonderivative hedging instruments. Includes discussion of the objectives for holding or issuing derivative instruments, the context needed to understand those objectives, and the strategies for achieving those objectives. The description generally distinguishes between derivative and nonderivative instruments by the types of hedging relationships and between those instruments used for risk management purposes and those used for other purposes. Information about those instruments is disclosed in the context of each instrument's primary underlying risk exposure (for example, interest rate, credit, foreign exchange rate, interest rate and foreign exchange rate, or overall price).

+ References + Details

Derivative Financial Instruments - Summary of Fair Value of Interest Rate Related Derivative Financial Instruments and Their Classification on Our Condensed Consolidated Balance Sheets (Details) - Interest Rate Swaps and Collars - Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Current Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives		$ 194
Other Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives		36
Other Current Liabilities
Derivative [Line Items]
Fair value of derivative instruments, liability derivatives	$ 2,008	51
Other Liabilities
Derivative [Line Items]
Fair value of derivative instruments, liability derivatives	$ 610	$ 127

Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on Our Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Designated as Hedging Instrument \| Interest Rate Swaps and Collars
Derivative Instruments Gain Loss [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative	$ (180)	$ (1,920)	$ (1,571)	$ (3,010)
Location of Gain or (Loss) Reclassified from Accumulated OCI into Income	Interest expense		Interest expense
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Net Income	$ (2)	456	$ (73)	925
Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion Excluded from Effectiveness Testing)	N/A		N/A
Designated as Hedging Instrument \| Cross Currency Swaps
Derivative Instruments Gain Loss [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative		2,052		(298)
Location of Gain or (Loss) Reclassified from Accumulated OCI into Income	N/A		N/A
Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion Excluded from Effectiveness Testing)	Interest income		Interest income
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)		233		688
Not Designated as Hedging Instrument \| Foreign Currency Forward Contracts
Derivative Instruments Gain Loss [Line Items]
Amount of Gain or (Loss) Recognized in Net Income	$ (391)	$ 1,660	$ (2,538)	$ (1,230)
Location of Gain or (Loss) Recognized in Net Income	Foreign currency loss, net		Foreign currency loss, net

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease expense	$ 3,669	$ 3,773	$ 7,399	$ 7,477
Finance lease expense:
Amortization of assets	209	245	418	489
Interest on lease liabilities	6	13	13	28
Short-term lease expense	122	98	216	134
Variable lease expense	738	802	1,449	1,420
Total lease expense	$ 4,744	$ 4,931	$ 9,495	$ 9,548

Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating leases:
Operating lease ROU assets	$ 51,739	$ 57,427
Current operating lease liabilities	11,417	12,554
Noncurrent operating lease liabilities	22,933	27,545
Total operating lease liabilities	34,350	40,099
Finance leases:
Finance lease ROU assets	2,507	3,396
Accumulated amortization	(1,880)	(1,924)
Finance lease ROU assets, net	627	1,472
Current finance lease liabilities	593	903
Non-current finance lease liabilities	0	138
Total finance lease liabilities	$ 593	$ 1,041
Weighted average remaining lease term (in years):
Operating leases	4 years 2 months 12 days	4 years 4 months 24 days
Finance leases	9 months 18 days	1 year 3 months 18 days
Weighted average discount rate:
Operating leases	3.90%	3.80%
Finance leases	3.00%	3.00%

Leases - Supplemental Cash Flow and Other Information Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash paid for the amounts included in the measurements of lease liabilities:
Operating cash outflows from operating leases	$ 9,753	$ 10,154
Operating cash outflows from finance leases	13	28
Financing cash outflow from finance leases	445	588
ROU assets obtained in exchange for lease liabilities incurred:
Operating leases	$ 532	$ 3,198

Leases - Schedule of Operating and Finance Lease Liability Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Leases, Remainder of 2020	$ 6,955
Operating Leases, 2021	10,150
Operating Leases, 2022	8,371
Operating Leases, 2023	4,501
Operating Leases, 2024	2,382
Operating Leases, 2025	2,288
Operating Leases, 2026 and thereafter	2,578
Operating Leases, Total lease payments	37,225
Operating Leases, Less: imputed interest	(2,875)
Total operating lease liabilities	34,350	$ 40,099
Operating Leases, Less: current obligations	(11,417)	(12,554)
Noncurrent operating lease liabilities	22,933	27,545
Finance Leases, Remainder of 2020	461
Finance Leases, 2021	139
Finance Leases, Total lease payments	600
Finance Leases, Less: imputed interest	(7)
Total finance lease liabilities	593	1,041
Finance Leases, Less: current obligations	(593)	(903)
Non-current finance lease liabilities	$ 0	$ 138

Employee Benefit Plans - Additional Information (Details) - Deferred Compensation Plan - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation arrangements, overall, description	We maintain a Non-Qualified Deferred Compensation Plan (the “Deferred Compensation Plan”) for executive officers, key employees and members of the Board of Directors. The Deferred Compensation Plan allows eligible participants to defer the receipt of eligible compensation, including equity awards, until designated future dates. We offset our obligations under the Deferred Compensation Plan primarily by investing in the actual underlying investments. At June 30, 2020 and December 31, 2019, these investments totaled approximately $11.2 million and $12.9 million, respectively.
Deferred compensation plan assets	$ 11.2	$ 12.9

Related Parties - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lite On Semiconductor
Related Party Transaction [Line Items]
Related Party ownership of common stock	15.00%		15.00%
Related Party Transaction, Description of Transaction			LSC is our largest stockholder, owning approximately 15% of our outstanding Common Stock as of June 30, 2020, and is a member of the Lite-On Group of companies.
Cash payments to acquire business					$ 437.0
Keylink
Related Party Transaction [Line Items]
Related Party ownership of common stock	5.00%		5.00%
Related Party Transaction, Description of Transaction			Keylink is our 5% joint venture partner in our Shanghai assembly and test facilities.
Related Party Transaction Consulting Fees from Transactions with Related Party	$ 3.8	$ 3.9	$ 6.9	$ 7.8
Chengdu Ya Guang Electronic Company Limited ("Ya Guang")
Related Party Transaction [Line Items]
Related Party Transaction, Description of Transaction			In addition, Chengdu Ya Guang Electronic Company Limited (“Ya Guang”) is our 2% joint venture partner in one of our Chengdu assembly and test facilities and is our 5% joint venture partner in our other Chengdu assembly and test facility
Chengdu Ya Guang Electronic Company Limited ("Ya Guang") \| Chengdu \| Assembly and Test Facility One
Related Party Transaction [Line Items]
Related Party ownership of common stock	2.00%		2.00%
Chengdu Ya Guang Electronic Company Limited ("Ya Guang") \| Chengdu \| Assembly and Test Facility Two
Related Party Transaction [Line Items]
Related Party ownership of common stock	5.00%		5.00%

Related Parties - Schedule of Net Sales and Purchases of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lite On Semiconductor
Related Party Transaction [Line Items]
Net sales from related parties	$ 171	$ 268	$ 299	$ 456
Purchases from related parties	3,806	4,079	6,554	8,491
Nuvoton
Related Party Transaction [Line Items]
Purchases from related parties	2,011	2,034	3,655	3,301
Keylink
Related Party Transaction [Line Items]
Net sales from related parties	4,975	3,566	8,960	6,381
Purchases from related parties	426	585	831	1,190
JCP
Related Party Transaction [Line Items]
Purchases from related parties	$ 291	$ 151	$ 447	$ 311

Related Parties - Schedule of Account Receivable and Payable of Related Party Transactions (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Lite On Semiconductor
Related Party Transaction [Line Items]
Accounts receivable	$ 171	$ 184
Accounts payable	2,799	2,154
Nuvoton
Related Party Transaction [Line Items]
Accounts payable	1,071	1,055
Keylink
Related Party Transaction [Line Items]
Accounts receivable	36,960	31,598
Accounts payable	32,029	28,244
JCP
Related Party Transaction [Line Items]
Accounts payable	$ 326	$ 173

Acquisitions - Additional Information (Details) $ in Millions	Feb. 05, 2020 USD ($) Tranche	Apr. 01, 2019 USD ($)	Jun. 30, 2021 USD ($)	Mar. 04, 2020 USD ($)
Savitech Corporation (“Savitech”)
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement	Feb. 05, 2020
Agreement amount to be invested	$ 14.2
Ownership percentage				33.60%
Number of tranche investment \| Tranche	2
Business acquisition aggregate consideration	$ 13.9
Savitech Corporation (“Savitech”) \| Minimum
Business Acquisition [Line Items]
Ownership percentage	51.00%
Savitech Corporation (“Savitech”) \| Forecast \| Minimum
Business Acquisition [Line Items]
Ownership percentage			51.00%
Savitech Corporation (“Savitech”) \| Forecast \| Maximum
Business Acquisition [Line Items]
Investment amount			$ 8.6
Savitech Corporation (“Savitech”) \| Selling, General and Administrative
Business Acquisition [Line Items]
Acquisition costs	$ 0.1
Savitech Corporation (“Savitech”) \| Tranche One
Business Acquisition [Line Items]
Investment amount				$ 5.6
Savitech Corporation (“Savitech”) \| Tranche Two \| Forecast \| Minimum
Business Acquisition [Line Items]
Ownership percentage			51.00%
Savitech Corporation (“Savitech”) \| Tranche Two \| Forecast \| Maximum
Business Acquisition [Line Items]
Investment amount			$ 8.4
Wafer Fabrication Facility ("GFAB")
Business Acquisition [Line Items]
Business acquisition aggregate consideration		$ 33.2
Acquisition date		Apr. 01, 2019
Wafer Fabrication Facility ("GFAB") \| Selling, General and Administrative
Business Acquisition [Line Items]
Acquisition costs		$ 0.6

Acquisitions - Summary of Fair Value of Assets and Liabilities Related to Acquisition Recorded in Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 04, 2020	Dec. 31, 2019	Apr. 01, 2019
Business Acquisition [Line Items]
Goodwill	$ 152,140		$ 141,318
Savitech Acquisition
Business Acquisition [Line Items]
Cash and cash equivalents		$ 6,200
Prepaid expenses and other		700
Goodwill		12,700
Intangible assets, net		6,100
Other long-term assets		300
Accrued liabilities and other		9,200
Noncontrolling interest		$ 11,700
Wafer Fabrication Facility ("GFAB")
Business Acquisition [Line Items]
Property, plant and equipment, net				$ 24,400
Inventories				3,600
Prepaid expenses and other				5,200
Goodwill				900
Deferred tax liabilities				$ 1,000