Diodes (DIOD) 10-Q 4 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Cover [Abstract]
Document type	10-Q
Document period end date	Sep. 30, 2019
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		51,041,969
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
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

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 218,349	$ 241,053
Short-term investments	7,928	7,499
Accounts receivable, net of allowances of $4,726 and $4,102 at September 30, 2019 and December 31, 2018, respectively	257,421	228,405
Inventories	230,815	215,435
Assets held for sale	4,947
Prepaid expenses and other	43,575	42,446
Total current assets	763,035	734,838
Property, plant and equipment, net	468,122	446,835
Deferred income tax	28,975	31,652
Goodwill	138,020	132,437
Intangible assets, net	125,446	137,935
Other	86,215	42,674
Total assets	1,609,813	1,526,371
Current liabilities:
Line of credit	17,086	10,254
Accounts payable	117,226	117,808
Accrued liabilities and other	106,456	82,605
Income tax payable	25,404	15,744
Current portion of long-term debt	31,532	27,613
Total current liabilities	297,704	254,024
Long-term debt, net of current portion	87,939	186,143
Deferred tax liabilities	18,661	17,993
Other long-term liabilities	128,411	90,779
Total liabilities	532,715	548,939
Commitments and contingencies (See Note 8)
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; 51,012,794 and 50,221,035, issued and outstanding at September 30, 2019 and December 31, 2018, respectively	34,982	34,454
Additional paid-in capital	417,576	399,915
Retained earnings	742,768	636,708
Treasury stock, at cost, 1,457,206 shares held at September 30, 2019 and December 31, 2018	(37,768)	(37,768)
Accumulated other comprehensive loss	(127,705)	(101,846)
Total stockholders' equity	1,029,853	931,463
Noncontrolling interest	47,245	45,969
Total equity	1,077,098	977,432
Total liabilities and stockholders' equity	$ 1,609,813	$ 1,526,371

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 4,726	$ 4,102
Preferred stock par value	$ 1	$ 1
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	51,012,794	50,221,035
Common stock shares outstanding	51,012,794	50,221,035
Treasury stock, shares	1,457,206	1,457,206

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 323,674	$ 320,946	$ 947,973	$ 899,543
Cost of goods sold	201,628	205,732	591,528	578,466
Gross profit	122,046	115,214	356,445	321,077
Operating expenses
Selling, general and administrative	46,123	42,475	137,143	131,778
Research and development	22,689	22,549	66,566	64,799
Amortization of acquisition related intangible assets	4,519	4,418	13,539	13,863
Other operating (income) expense		(66)	(158)	15
Total operating expense	73,331	69,376	217,090	210,455
Income from operations	48,715	45,838	139,355	110,622
Other income (expense)
Interest income	272	474	1,780	1,431
Interest expense	(2,007)	(2,318)	(6,163)	(7,619)
Foreign currency (loss) gain, net	(822)	(655)	(1,382)	(3,384)
Other income	2,577	1,061	5,056	6,073
Total other income (expense)	20	(1,438)	(709)	(3,499)
Income before income taxes and noncontrolling interest	48,735	44,400	138,646	107,123
Income tax provision	10,613	13,190	32,085	31,726
Net income	38,122	31,210	106,561	75,397
Less net (income) attributable to noncontrolling interest	(62)	(302)	(501)	(895)
Net income attributable to common stockholders	$ 38,060	$ 30,908	$ 106,060	$ 74,502
Earnings per share attributable to common stockholders:
Basic	$ 0.75	$ 0.62	$ 2.09	$ 1.50
Diluted	$ 0.73	$ 0.61	$ 2.05	$ 1.46
Number of shares used in earnings per share computation:
Basic	50,998	50,115	50,687	49,713
Diluted	51,869	51,077	51,699	50,883

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest [Abstract]
Net income	$ 38,122	$ 31,210	$ 106,561	$ 75,397
Unrealized (loss) gain on defined benefit plan, net of tax	(6,553)	(493)	(11,562)	7,207
Unrealized gain (loss) on swaps and collars, net of tax	259	378	(3,146)	3,653
Unrealized foreign currency loss, net of tax	(9,186)	(9,849)	(11,151)	(18,978)
Comprehensive income	22,642	21,246	80,702	67,279
Less: Comprehensive income attributable to noncontrolling interest	(62)	(302)	(501)	(895)
Total comprehensive income attributable to common stockholders	$ 22,580	$ 20,944	$ 80,201	$ 66,384

CONDENSED CONSOLIDATED STATEM_3

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, 2017	$ 873,918	$ 33,727	$ (37,768)	$ 386,338	$ 532,687	$ (83,480)	$ 831,504	$ 42,414
Common stock shares beginning at Dec. 31, 2017		50,587,000	(1,457,000)
Total comprehensive income	67,279				74,502	(8,118)	66,384	895
Noncontrolling interests	4,209							4,209
Dividends to noncontrolling interest	(2,735)							(2,735)
Common stock issued for share-based plans	4,861	$ 706		4,155			4,861
Common stock issued for share-based plans, shares		1,061,000
Share-based compensation	15,975			15,975			15,975
Tax related to net share settlement	(11,056)			(11,056)			(11,056)
BALANCE at Sep. 30, 2018	952,451	$ 34,433	$ (37,768)	395,412	607,189	(91,598)	907,668	44,783
Common stock shares ending at Sep. 30, 2018		51,648,000	(1,457,000)
BALANCE at Jun. 30, 2018	922,815	$ 34,204	$ (37,768)	391,332	576,280	(81,633)	882,415	40,400
Common stock shares beginning at Jun. 30, 2018		51,303,000	(1,457,000)
Total comprehensive income	21,246				30,909	(9,965)	20,944	302
Noncontrolling interests	4,209							4,209
Dividends to noncontrolling interest	(128)							(128)
Common stock issued for share-based plans	1,852	$ 229		1,623			1,852
Common stock issued for share-based plans, shares		345,000
Share-based compensation	4,896			4,896			4,896
Tax related to net share settlement	(2,439)			(2,439)			(2,439)
BALANCE at Sep. 30, 2018	952,451	$ 34,433	$ (37,768)	395,412	607,189	(91,598)	907,668	44,783
Common stock shares ending at Sep. 30, 2018		51,648,000	(1,457,000)
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	50,221,035	51,678,000	(1,457,000)
Total comprehensive income	$ 80,702				106,060	(25,859)	80,201	501
Noncontrolling interests	3,343							3,343
Dividends to noncontrolling interest	(2,568)							(2,568)
Common stock issued for share-based plans	7,208	$ 528		6,680			7,208
Common stock issued for share-based plans, shares		792,000
Share-based compensation	15,364			15,364			15,364
Tax related to net share settlement	(4,383)			(4,383)			(4,383)
BALANCE at Sep. 30, 2019	$ 1,077,098	$ 34,982	$ (37,768)	417,576	742,768	(127,705)	1,029,853	47,245
Common stock shares ending at Sep. 30, 2019	51,012,794	52,470,000	(1,457,000)
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 beginning at Jun. 30, 2019		52,202,000	(1,457,000)
Total comprehensive income	22,642				38,060	(15,480)	22,580	62
Common stock issued for share-based plans	503	$ 179		324			503
Common stock issued for share-based plans, shares		268,000
Share-based compensation	5,589			5,589			5,589
Tax related to net share settlement	(2,788)			(2,788)			(2,788)
BALANCE at Sep. 30, 2019	$ 1,077,098	$ 34,982	$ (37,768)	$ 417,576	$ 742,768	$ (127,705)	$ 1,029,853	$ 47,245
Common stock shares ending at Sep. 30, 2019	51,012,794	52,470,000	(1,457,000)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net income	$ 106,561	$ 75,397
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions
Depreciation and amortization	81,302	76,868
Share-based compensation expense	15,364	15,975
Other	(206)	(615)
Changes in operating assets:
Change in accounts receivable	(29,868)	(28,596)
Change in inventory	(9,062)	(5,378)
Change in other operating assets	(3,475)	(11,177)
Changes in operating liabilities:
Change in accrued liabilities	10,206	9,070
Change in income tax payable (refundable)	9,853	(2,388)
Change in other operating liabilities	(2,970)	(5,228)
Net cash flows provided by operating activities	177,705	123,928
Cash flows from investing activities
Acquisitions, net of cash received	(33,029)	(41)
Purchases of property, plant and equipment	(76,128)	(72,159)
Purchases of short-term investments	(15,921)	(13,959)
Proceeds from maturity of short-term investments	15,332	10,831
Other	(430)	1,235
Net cash and cash equivalents used in investing activities	(110,176)	(74,093)
Cash flows from financing activities
Advances on lines of credit and short-term debt	9,954	9,151
Repayments of line of credit and short-term debt	(3,067)
Taxes paid related to net share settlement	(4,383)	(11,056)
Proceeds from long-term debt	278,237	304,656
Repayments of long-term debt	(372,976)	(408,863)
Net proceeds from issuance of common stock	7,208	4,861
Repayment of and proceeds from finance lease obligation	(912)	1,489
Dividend distribution to noncontrolling interests	(2,577)	(2,694)
Capital contribution from noncontrolling interest		5,263
Other	1,524	(764)
Net cash and cash equivalents used in financing activities	(86,992)	(97,957)
Effect of exchange rate changes on cash and cash equivalents	(2,614)	(6,039)
Change in cash and cash equivalents, including restricted cash	(22,077)	(54,161)
Cash and cash equivalents, beginning of period, including restricted cash	241,833	205,262
Cash and cash equivalents, end of period, including restricted cash	219,756	151,101
Supplemental Cash Flow Information
Interest paid during the period	5,781	7,661
Taxes paid during the period	24,422	29,435
Non-cash investing and financing activities:
(Increase) decrease in accounts payable related to the purchase of property, plant and equipment	$ (1,263)	$ 8,093

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 218,349	$ 150,274
Restricted cash (included in other current assets)	1,407	827
Total cash, cash equivalents and restricted cash	$ 219,756	$ 151,101

Nature of Operations, Basis of

Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies and Estimates	9 Months Ended
	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies and Estimates	NOTE 1 – Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies and Estimates Nature 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, 2018 is derived from audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 filed with the Securities and Exchange Commission (“SEC”) on February 21, 2019 (“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 nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2019. 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 The Financial Accounting Standards Board (“FASB”) issued the following Accounting Standards Updates (“ASU”) which could have potential impact on the Company’s financial statements: Recently Adopted Standards ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”) – In February 2016, the FASB issued ASU 2016-02, which amends the accounting treatment for leases and requires, among other things, lessees to recognize a right-of-use (“ROU”) asset and lease liability for most lease arrangements. The amendments were effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company adopted ASU 2016-02 on January 1, 2019, using the modified retrospective transition approach, under which financial results reported in periods prior to 2018 are unchanged. We elected the following allowed practical expedients as permitted under the transition guidance within the new standard: • Not record leases with an initial term of 12 months on the balance sheet; • Not separate non-lease components of leases from the lease components; and • Not reassess (1) the definition of a lease, (2) lease classification, and (3) initial direct costs for existing leases during transition. Upon adoption of ASU 2016-02, the Company recorded ROU assets of $68.3 million, including land-use rights of $17.1 million previously recorded in other assets and $2.5 million previously recorded in property, plant and equipment and ROU liabilities of $50.4 million. For additional information related to the Company’s leases, see Note 10. ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting ("ASU 2018-07") - In June 2018, the FASB issued ASU 2018-07, which simplifies several aspects of the accounting for nonemployee share-based payment transactions resulting from expanding the scope of Topic 718, Compensation—Stock Compensation, to include share-based payment transactions for acquiring goods and services from nonemployees. ASU 2018-07 was effective for the Company on January 1, 2019. The adoption of this standard did not have a material effect on our condensed consolidated financial statements or disclosures. ASU No. 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”) -In August 2017, the FASB issued ASU No. 2017-12 to better align hedge accounting with risk management strategies, and as a result, more hedging strategies will be eligible for hedge accounting. Public business entities will have until the end of the first quarter in which a hedge is designated to perform an initial assessment of a hedge’s effectiveness. After initial qualification, the new guidance permits a qualitative effectiveness assessment for certain hedges instead of a quantitative test if the company can reasonably support an expectation of high effectiveness throughout the term of the hedge. An initial quantitative test to establish that the hedge relationship is highly effective is still required. The amendments are effective for fiscal years beginning after December 15, 2018, and the Company adopted the new standard January 1, 2019. The new standard had no impact on the Company’s financial statements. On January 1, 2019, the Company adopted ASU No. 2018-16, “Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes”. The amendments in this ASU permit the use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under ASC 815, in addition to the currently permissible benchmark interest rates. This ASU provides the Company the ability to utilize the OIS rate based on SOFR as the benchmark interest rate on certain hedges of interest rate risk. The new standard had no impact on the Company’s financial statements. Standards Effective in Future Years The FASB has issued the following relevant standards, effective in future years, which are not expected to have a material impact on our consolidated condensed financial statements: Standard No. Standard Name Standard Effective Date 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement January 1, 2020 2018-14 Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans January 1, 2020 In April 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, that clarifies and improves areas of guidance related to the recently issued standards on credit losses (ASU 2016-13), hedging (ASU 2017-12), and recognition and measurement of financial instruments (ASU 2016-01). The amendments generally have the same effective dates as their related standards. If already adopted, the amendments of ASU 2016-01 and ASU 2016-13 are effective for fiscal years beginning after December 15, 2019 and the amendments of ASU 2017-12 are effective as of the beginning of t he Company’s next annual reporting period; early adoption is permitted. The Company is currently evaluating the impact this change will have on its consolidated financial statements and disclosures. All other issued and not yet effective accounting standards are not expected to be relevant to the Company. Updates to Accounting Policies and Estimates Leases The Company determines if an arrangement is a lease at inception. ROU assets are included in Other assets in the Company’s condensed consolidated balance sheets. Current ROU liabilities are included in Accrued liabilities and other and long-term ROU liabilities are included in Other long-term liabilities, in our condensed consolidated balance sheets. ROU assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent its obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. To determine the present value of the lease payments, we estimate our incremental borrowing rate based on information available at the lease commencement date. The Company’s lease term includes options to extend the lease when it is reasonably certain that it will exercise that option. Leases with a term of 12 months or less are not recorded on the balance sheet. Our leases typically do not contain any residual value guarantees. For real estate, we account for the lease and non-lease components as a single lease component.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2019
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 nine months ended September 30, 2019 and 2018 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 Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Earnings (numerator) Net income attributable to common stockholders $ 38,060 $ 30,908 $ 106,060 $ 74,502 Shares (denominator) Weighted average common shares outstanding (basic) 50,998 50,115 50,687 49,713 Dilutive effect of stock options and stock awards outstanding 871 962 1,012 1,170 Adjusted weighted average common shares outstanding (diluted) 51,869 51,077 51,699 50,883 Earnings per share attributable to common stockholders Basic $ 0.75 $ 0.62 $ 2.09 $ 1.50 Diluted $ 0.73 $ 0.61 $ 2.05 $ 1.46 Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive 3 - 107 94

Inventories

Inventories	9 Months Ended
	Sep. 30, 2019
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: September 30, 2019 December 31, 2018 Finished goods $ 59,721 $ 59,244 Work-in-progress 67,446 59,166 Raw materials 103,648 97,025 Total $ 230,815 $ 215,435

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2019
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, 2018 $ 132,437 Acquisitions: Wafer fabrication facility in Greenock, Scotland (a) 931 Canyon investment (b) 1,671 ERIS investment in Yea-Shin (c) 4,320 Foreign currency translation adjustment (1,339 ) Balance at September 30, 2019 $ 138,020 The increase in goodwill is related to: (a) The Company’s acquisition accounting for the purchase of a wafer fabrication facility in Greenock, Scotland, (“GFAB”). (See Note 13 for additional information). (b) The Company’s acquisition accounting for the Company’s investment of $3.4 million in Canyon Semiconductor. This investment brings our ownership of Canyon to 51%. During the nine months ended September 30 2019, as a measurement period adjustment, we finalized our acquisition accounting with finalization of (c) The Company’s acquisition accounting related to Eris’ investment of approximately $6.4 million in Yea-Shin Technology Corporation. During the second quarter of 2019, as a measurement period adjustment, we increased goodwill approximately $4.3 million, related to finalization of deferred taxes. The Company owns approximately 51% of Eris and Eris owns approximately 60% of Yea-Shin. The table below sets forth the value of intangible assets, other than goodwill: September 30, December 31, 2019 2018 Intangible assets subject to amortization: Gross carrying amount $ 244,554 $ 238,867 Accumulated amortization (119,949 ) (106,410 ) Foreign currency translation adjustment (8,271 ) (8,281 ) Total 116,334 124,176 Intangible assets with indefinite lives: Gross carrying amount 10,303 14,883 Foreign currency translation adjustment (1,191 ) (1,124 ) Total 9,112 13,759 Total intangible assets, net $ 125,446 $ 137,935 The table below sets forth amortization expense related to intangible assets subject to amortization: Amortization expense 2019 2018 Three months ended September 30 $ 4,519 $ 4,418 Nine months ended September 30 $ 13,539 $ 13,863

Income Tax Provision

Income Tax Provision	9 Months Ended
	Sep. 30, 2019
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 Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Domestic pre-tax income (loss) $ 13,547 $ (7,267 ) $ 34,097 $ (11,289 ) Foreign pre-tax income $ 35,188 $ 51,667 $ 104,549 $ 118,412 Income tax provision $ 10,613 $ 13,190 $ 32,085 $ 31,726 Effective tax rate 21.8 % 29.7 % 23.1 % 29.6 % Impact of tax holidays on tax expense $ 330 $ 638 $ 1,179 $ (104 ) Earnings per share impact of tax holidays: Basic $ (0.01 ) $ (0.01 ) $ (0.02 ) $ - Diluted $ (0.01 ) $ (0.01 ) $ (0.02 ) $ - The decrease in the effective tax rate for the three and nine months ended September 30, 2019 when compared to the three and nine months ended September 30, 2018, is primarily attributable to an increase in estimated full year global pretax book income and a net decrease in unfavorable U.S. permanent differences. Our undistributed foreign earnings continue to be indefinitely reinvested in foreign operations, with limited exceptions related to earnings of 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 2009. 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 2013. 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 September 30, 2019, the gross amount of unrecognized tax benefits was approximately $33.8 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.

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2019
Share Based Compensation [Abstract]
Share-Based Compensation	NOTE 6 – Share-Based Compensation The table below sets forth the line items where share-based compensation expense was recorded: Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Cost of goods sold $ 281 $ 96 $ 665 $ 267 Selling, general and administrative 4,566 3,993 12,513 13,477 Research and development 742 807 2,186 2,233 Total share-based compensation expense $ 5,589 $ 4,896 $ 15,364 $ 15,977 The table below sets forth share-based compensation expense by type: Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Stock options $ - $ - $ - $ 275 Share grants 5,589 4,896 15,364 15,702 Total share-based compensation expense $ 5,589 $ 4,896 $ 15,364 $ 15,977 Stock Options. Approximately $7.2 million in cash proceeds was received from stock option exercises during the nine months ended September 30, 2019. As of September 30, 2019, we had no unrecognized share-based compensation expense related to unvested stock options. Share Grants. Restricted stock awards and restricted stock units generally vest in equal annual installments over a four-year period. We also have share grants that are performance-based and time-based that vest upon achievement of certain performance criteria over time. As of September 30, 2019, total unrecognized share-based compensation expense related to share grants was approximately $44.4 million, before income taxes, and is expected to be recognized over a weighted average period of approximately 2.3 years.

Segment Information and Net Sal

Segment Information and Net Sales	9 Months Ended
	Sep. 30, 2019
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 September 30, 2018, one customer, a broad-based global distributor that sells to thousands of different end users, accounted for 10.2%, or $32.7 million, respectively, of our net sales. No customer accounted for 10% or more of our revenue for any other period presented. This customer did not account for 10% or greater of our outstanding accounts receivable at September 30, 2019 or 2018. The tables below set forth net sales based on the location of the subsidiary producing the net sale. Three Months Ended September 30, 2019 Asia North America Europe Consolidated Total sales $ 323,876 $ 175,900 $ 63,583 $ 563,359 Intercompany elimination (115,879 ) (96,150 ) (27,656 ) (239,685 ) Net sales $ 207,997 $ 79,750 $ 35,927 $ 323,674 Three Months Ended September 30, 2018 Asia North America Europe Consolidated Total sales $ 283,635 $ 51,640 $ 49,209 $ 384,484 Intercompany elimination (40,690 ) (8,773 ) (14,075 ) (63,538 ) Net sales $ 242,945 $ 42,867 $ 35,134 $ 320,946 As of and for the Nine Months Ended September 30, 2019 Asia North America Europe Consolidated Total sales $ 917,516 $ 450,874 $ 180,759 $ 1,549,149 Intercompany elimination (305,581 ) (228,344 ) (67,251 ) (601,176 ) Net sales $ 611,935 $ 222,530 $ 113,508 $ 947,973 Property, plant and equipment, net $ 385,862 $ 23,186 $ 59,074 $ 468,122 Total assets 1,173,683 237,467 198,663 $ 1,609,813 As of and for the Nine Months Ended September 30, 2018 Asia North America Europe Consolidated Total sales $ 797,455 $ 116,868 $ 150,382 $ 1,064,705 Intercompany elimination (106,330 ) (16,276 ) (42,556 ) (165,162 ) Net sales $ 691,125 $ 100,592 $ 107,826 $ 899,543 Property, plant and equipment, net $ 399,632 $ 30,133 $ 24,321 $ 454,086 Total assets $ 1,075,840 $ 202,024 $ 189,920 $ 1,467,784 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 sell our products to customers in multiple areas of the world including Asia, Europe, and North America. Across these regions, we sell products to end users in a variety of markets such as 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 the amount of net sales by type ( direct sales or Distributor Net Sales for the Three Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China $ 57,952 $ 60,037 $ 105,305 $ 113,191 U.S. 2,388 4,409 20,723 30,550 Korea 6,546 4,597 10,594 13,250 Germany 3,079 3,076 16,705 20,912 Singapore 124 637 16,166 16,979 Taiwan 819 621 21,850 17,675 All others (1) 39,405 20,574 22,018 14,438 Total $ 110,313 $ 93,951 $ 213,361 $ 226,995 Percent of Net Sales by Type for the Three Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China 53 % 64 % 49 % 50 % U.S. 2 % 5 % 10 % 13 % Korea 6 % 5 % 5 % 6 % Germany 3 % 3 % 8 % 9 % Singapore — 1 % 8 % 7 % Taiwan 1 % 1 % 10 % 8 % All others (1) 35 % 21 % 10 % 7 % Total 100 % 100 % 100 % 100 % Total Net Sales for the Three Months Ended September 30, Dollars Percent of Net Sales 2019 2018 2019 2018 China $ 163,257 $ 173,228 50 % 54 % U.S. 23,111 34,959 7 % 11 % Korea 17,140 17,847 5 % 6 % Germany 19,784 23,988 6 % 7 % Singapore 16,290 17,616 5 % 5 % Taiwan 22,669 18,296 7 % 6 % All others (1) 61,423 35,012 20 % 11 % Total $ 323,674 $ 320,946 100 % 101 % Net Sales for the Nine Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China $ 169,861 $ 164,109 $ 305,197 $ 323,875 U.S. 8,509 12,866 78,693 78,081 Korea 17,309 12,148 27,588 32,163 Germany 9,536 9,001 53,355 63,343 Singapore 490 1,549 47,022 52,380 Taiwan 1,977 2,399 65,421 52,696 All others (1) 97,920 52,558 65,095 42,375 Total $ 305,602 $ 254,630 $ 642,371 $ 644,913 Percent of Net Sales by Type for the Nine Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China 56 % 64 % 48 % 50 % U.S. 3 % 5 % 12 % 12 % Korea 6 % 5 % 4 % 5 % Germany 3 % 4 % 8 % 10 % Singapore — 1 % 7 % 8 % Taiwan 1 % 1 % 10 % 8 % All others (1) 31 % 20 % 11 % 7 % Total 100 % 100 % 100 % 100 % Total Net Sales for the Nine Months Ended September 30, Dollar Percent of Net Sales 2019 2018 2019 2018 China $ 475,058 $ 487,984 50 % 54 % U.S. 87,202 90,947 9 % 10 % Korea 44,897 44,311 5 % 5 % Germany 62,891 72,344 7 % 8 % Singapore 47,512 53,929 5 % 6 % Taiwan 67,398 55,095 7 % 6 % All others (1) 163,015 94,933 17 % 11 % Total $ 947,973 $ 899,543 100 % 100 % (1) Represents countries with less than 3% of the total net sales each.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 8 – Commitments and Contingencies Purchase commitments – As of September 30, 2019, we had approximately $26.1 million in non-cancelable purchase contracts related to capital expenditures, primarily related to our manufacturing facilities in Asia. As of September 30, 2019, we also had a commitment to purchase approximately $72.7 million of wafers to be used in our manufacturing process. These wafer purchases will occur during 2019 and 2020. Defined Benefit Plan - We have a contributory defined benefit plan that covers certain employees in the United Kingdom. As of September 30, 2019, the unfunded liability for this defined benefit plan was approximately $33.0 million. We are obligated to make annual contributions, each year through December 2029, of approximately GBP 2 million (approximately $2.6 million based on a GBP: USD exchange rate of 1.3:1). It is necessary for the Trustees to review the contributions required to fund the benefits promised to the employees at least every three years. A review as of April 2019 is underway and the outcome of the review could result in a change in the amount of the payment or the period over which payment is required. Contingencies – From time to time, we are involved in various legal procee dings 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 posi tion, 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 consider s material.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 9 – 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 September 30, 2019, we had 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 815. The fair value of these instruments approximates zero. The table below sets forth outstanding foreign currency forward contracts at September 30, 2019 and December 31, 2018: Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 2,242 September 2019 November 2019 EUR/GBP 0.88592 Non-designated 2,785 September 2019 November 2019 EUR/USD 1.0939 Non-designated 21,195 September 2019 November 2019 GBP/USD 1.2328 Non-designated 39,681 September 2019 November 2019 USD/CNY 7.0985 Non-designated 806 September 2019 November 2019 USD/JPY 108.08 Non-designated 33,733 September 2019 November 2019 USD/TWD 30.925 Non-designated 500 January 2019 October 2019 USD/TWD 30.635 Non-designated 500 January 2019 January 2020 USD/TWD 30.635 Non-designated 500 January 2019 November 2019 USD/TWD 30.705 Non-designated $ 101,942 Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 1,221 December 2018 February 2019 EUR/GBP 0.8981 Non-designated 12,538 December 2018 February 2019 EUR/USD 1.1479 Non-designated 8,463 December 2018 February 2019 GBP/USD 1.2785 Non-designated 44,946 December 2018 February 2019 USD/CNY 6.8738 Non-designated 844 December 2018 February 2019 USD/JPY 110.14 Non-designated 54,041 December 2018 February 2019 USD/TWD 30.559 Non-designated 300 December 2018 January 2019 USD/TWD 30.669 Non-designated $ 122,353 * EUR = Euro GBP = British Pound Sterling USD = United States Dollar CNY = Chinese Yuan Renminbi JPY = Japan Yen TWD = Taiwan dollar Hedges of Interest Rate and Net Investment Risk - The Company’s objective in using interest rate swaps and collars is to minimize the risks associated with its floating rate debt. The Company makes use of cross currency swaps to decrease the foreign exchange risk inherent in the Company’s investment in its foreign subsidiaries. Number of Instruments Notional Amount September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 Interest rate swaps and collars 10 12 $ 200,000 $ 210,000 The table below sets forth the fair value of the Company’s derivative financial instruments, excluding adjustments for performance risk, if any, as well as their classification on our condensed consolidated balance sheets: Other Current Assets Other Assets Other Current Liabilities Other Liabilities September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 Interest rate swaps and collars $ 299 $ 1,936 $ 0 $ 2,795 $ 57 $ - $ 407 $ - The tables below sets forth the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the three and nine months ended September 30, 2019 and 2018: 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 September 30, September 30, September 30, 2019 2018 2019 2018 2019 2018 Three Months Ended Interest rate swaps and collars $ (136 ) $ 636 Interest expense $ 224 $ 299 N/A - - Cross currency swaps $ - $ - N/A - - Interest income - - Nine Months Ended Interest rate swaps and collars $ (3,145 ) $ 4,143 Interest expense $ 1,149 $ 526 N/A - - Cross currency swaps $ (298 ) $ - N/A - - Interest income $ 688 $ - We estimate that $0.2 million of net derivative gains included in accumulated other comprehensive income (“AOCI”) as of September 30, 2019 will be reclassified into earnings 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 months ended September 30, 2019 or 2018. 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 September 30, 2019 2018 Three Months Ended Foreign currency forward contracts $ (2,563 ) $ (2,200 ) Foreign currency loss, net Nine Months Ended Foreign currency forward contracts $ (3,793 ) $ (7,570 ) Foreign currency loss, net As of September 30, 2019 and December 31, 2018, the Company had not posted any collateral related to these agreements.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	NOTE 10 – 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 Nine Months Ended September 30, 2019 September 30, 2019 Operating lease expense $ 3,671 $ 11,148 Finance lease expense: Amortization of assets 244 733 Interest on lease liabilities 11 39 Short-term lease expense 89 223 Variable lease expense 681 2,101 Total lease expense $ 4,696 $ 14,244 The table below sets forth supplemental balance sheet information related to leases: September 30, 2019 Operating leases: Operating lease ROU assets $60,217 Current operating lease liabilities 12,235 Noncurrent operating lease liabilities 29,920 Total operating lease liabilities $42,155 Finance leases: Finance lease ROU assets $3,396 Accumulated amortization (1,680) Finance lease ROU assets, net $1,716 Current finance lease liabilities $896 Non-current finance lease liabilities 367 Total finance lease liabilities $1,263 Weighted average remaining lease term (in years): Operating leases 4.6 Finance leases 1.5 Weighted average discount rate: Operating leases 3.8% Finance leases 3.6% The table below sets forth supplemental cash flow and other information related to leases: Nine Months Ended September 30, 2019 Cash paid for the amounts included in the measurements of lease liabilities: Operating cash outflows from operating leases $14,728 Operating cash outflows from finance leases 39 Financing cash outflow from finance leases 912 ROU assets obtained in exchange for lease liabilities incurred: Operating leases 3,611 The table below sets forth information about lease liability maturities: September 30, 2019 Operating Leases Finance Leases Remainder of 2019 $ 3,535 $ 230 2020 13,410 922 2021 9,476 139 2022 8,028 - 2023 4,437 - 2024 2,370 - 2025 and thereafter 4,785 - Total lease payments 46,041 1,291 Less: imputed interest (3,886) (28) Total lease obligations 42,155 1,263 Less: current obligations (12,235) (896) Long-term lease obligations $ 29,920 $ 367

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	NOTE 11 – Employee Benefit Plans Deferred Compensation 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 by investing in the actual underlying investments. These investments are classified as trading securities and are carried at fair value. At September 30, 2019 and December 31, 2018, these investments totaled approximately $11.5 million and $10.6 million, respectively. All gains and losses in these investments are materially offset by corresponding gains and losses in the Deferred Compensation Plan liabilities.

Related Parties

Related Parties	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
Related Parties	NOTE 12 – 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 o ur ou t s t a nd i n g C o m m on S toc k as of September 30, 2 019 , a n d i s a m e m ber of t he L ite- On G r o u p o f c o m p a n ies . On August 8, 2019, we announced that we entered into an agreement with LSC pursuant to which the Company shall acquire LSC, see Note 13 for additional information. 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 September 30, 2019 and 2018 were approximately $3.7 million and $3.8 million, respectively. The aggregate amounts paid to Keylink for the nine months ended September 30, 2019 and 2018 were approximately $11.5 million and $12.6 million, respectively. I n a dd itio n, Y a G u a ng”) is our 2% joint venture partner in one of our Chengdu assembly and test facilities and i s o ur 5 j o i nt v e n t ure p a r t n e r i n ou r other C h eng du asse m bly a nd tes t facility ; h owe v er, 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 C t a e e i i a a c t m The table below sets forth net sales to and purchases from related parties: Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 LSC Net sales $ 273 $ 304 $ 729 $ 896 Purchases $ 2,548 $ 5,208 $ 11,039 $ 16,630 Nuvoton Purchases $ 2,650 $ 2,361 $ 5,951 $ 7,774 Keylink Net sales $ 4,923 $ 4,684 $ 11,304 $ 8,762 Purchases $ 604 $ 907 $ 1,794 $ 2,646 JCP Purchases $ 151 $ 201 $ 462 $ 488 The table below sets forth accounts receivable from, and accounts payable to, related parties: September 30, December 31, 2019 2018 LSC Accounts receivable $ 337 $ 286 Accounts payable $ 1,749 $ 2,696 Nuvoton Accounts payable $ 1,238 $ 1,939 Keylink Accounts receivable $ 15,004 $ 6,264 Accounts payable $ 11,597 $ 4,656 JCP Accounts payable $ 206 $ 151

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisitions	Note 13 –Acquisitions Wafer Fabrication Facility Acquisition On April 1, 2019, the Company completed the previously announced acquisition of a wafer fabrication facility (“GFAB”) located in Greenock, Scotland. 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 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 LSC Acquisition On August 8, 2019, we announced we had entered into a Share Swap Agreement that provides for the acquisition of LSC by the Company for approximately $428 million in cash. This amount is subject to change, based on Taiwan dollar to United States dollar exchange rates at closing. The acquisition received LSC shareholder approval on October 25, 2019, but is subject to customary closing conditions and regulatory approvals. We expect to fund the purchase price of the transaction primarily with proceeds from a new bank financing arrangement. We anticipate completing the acquisition in April 2020.

Assets Held for Sale

Assets Held for Sale	9 Months Ended
	Sep. 30, 2019
Real Estate Assets Held For Development And Sale [Abstract]
Assets Held for Sale	Note 14 – Assets Held for Sale Assets held for sale consist of approximately 16 acres of raw land located in Plano, Texas, that the Company is in the process of selling. The land was originally acquired as a site to construct a future corporate headquarters. The Company decided that its existing headquarters is adequate and construction of a new headquarters building is not necessary. The Company has been actively marketing the land and has a signed contract to sell the land to an unaffiliated third party for cash. During the second quarter of 2019, the buyer received necessary local zoning approval for its building plans. We anticipate the sale will close within the next 12 months. We have not recorded any impairment charges in connection with the land.

Nature of Operations, Basis o_2

Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies and Estimates (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Nature of Operations	Nature 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, 2018 is derived from audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 filed with the Securities and Exchange Commission (“SEC”) on February 21, 2019 (“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 nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2019. 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 The Financial Accounting Standards Board (“FASB”) issued the following Accounting Standards Updates (“ASU”) which could have potential impact on the Company’s financial statements: Recently Adopted Standards ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”) – In February 2016, the FASB issued ASU 2016-02, which amends the accounting treatment for leases and requires, among other things, lessees to recognize a right-of-use (“ROU”) asset and lease liability for most lease arrangements. The amendments were effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company adopted ASU 2016-02 on January 1, 2019, using the modified retrospective transition approach, under which financial results reported in periods prior to 2018 are unchanged. We elected the following allowed practical expedients as permitted under the transition guidance within the new standard: • Not record leases with an initial term of 12 months on the balance sheet; • Not separate non-lease components of leases from the lease components; and • Not reassess (1) the definition of a lease, (2) lease classification, and (3) initial direct costs for existing leases during transition. Upon adoption of ASU 2016-02, the Company recorded ROU assets of $68.3 million, including land-use rights of $17.1 million previously recorded in other assets and $2.5 million previously recorded in property, plant and equipment and ROU liabilities of $50.4 million. For additional information related to the Company’s leases, see Note 10. ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting ("ASU 2018-07") - In June 2018, the FASB issued ASU 2018-07, which simplifies several aspects of the accounting for nonemployee share-based payment transactions resulting from expanding the scope of Topic 718, Compensation—Stock Compensation, to include share-based payment transactions for acquiring goods and services from nonemployees. ASU 2018-07 was effective for the Company on January 1, 2019. The adoption of this standard did not have a material effect on our condensed consolidated financial statements or disclosures. ASU No. 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”) -In August 2017, the FASB issued ASU No. 2017-12 to better align hedge accounting with risk management strategies, and as a result, more hedging strategies will be eligible for hedge accounting. Public business entities will have until the end of the first quarter in which a hedge is designated to perform an initial assessment of a hedge’s effectiveness. After initial qualification, the new guidance permits a qualitative effectiveness assessment for certain hedges instead of a quantitative test if the company can reasonably support an expectation of high effectiveness throughout the term of the hedge. An initial quantitative test to establish that the hedge relationship is highly effective is still required. The amendments are effective for fiscal years beginning after December 15, 2018, and the Company adopted the new standard January 1, 2019. The new standard had no impact on the Company’s financial statements. On January 1, 2019, the Company adopted ASU No. 2018-16, “Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes”. The amendments in this ASU permit the use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under ASC 815, in addition to the currently permissible benchmark interest rates. This ASU provides the Company the ability to utilize the OIS rate based on SOFR as the benchmark interest rate on certain hedges of interest rate risk. The new standard had no impact on the Company’s financial statements. Standards Effective in Future Years The FASB has issued the following relevant standards, effective in future years, which are not expected to have a material impact on our consolidated condensed financial statements: Standard No. Standard Name Standard Effective Date 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement January 1, 2020 2018-14 Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans January 1, 2020 In April 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, that clarifies and improves areas of guidance related to the recently issued standards on credit losses (ASU 2016-13), hedging (ASU 2017-12), and recognition and measurement of financial instruments (ASU 2016-01). The amendments generally have the same effective dates as their related standards. If already adopted, the amendments of ASU 2016-01 and ASU 2016-13 are effective for fiscal years beginning after December 15, 2019 and the amendments of ASU 2017-12 are effective as of the beginning of t he Company’s next annual reporting period; early adoption is permitted. The Company is currently evaluating the impact this change will have on its consolidated financial statements and disclosures. All other issued and not yet effective accounting standards are not expected to be relevant to the Company. Updates to Accounting Policies and Estimates Leases The Company determines if an arrangement is a lease at inception. ROU assets are included in Other assets in the Company’s condensed consolidated balance sheets. Current ROU liabilities are included in Accrued liabilities and other and long-term ROU liabilities are included in Other long-term liabilities, in our condensed consolidated balance sheets. ROU assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent its obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. To determine the present value of the lease payments, we estimate our incremental borrowing rate based on information available at the lease commencement date. The Company’s lease term includes options to extend the lease when it is reasonably certain that it will exercise that option. Leases with a term of 12 months or less are not recorded on the balance sheet. Our leases typically do not contain any residual value guarantees. For real estate, we account for the lease and non-lease components as a single lease component.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
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 Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Earnings (numerator) Net income attributable to common stockholders $ 38,060 $ 30,908 $ 106,060 $ 74,502 Shares (denominator) Weighted average common shares outstanding (basic) 50,998 50,115 50,687 49,713 Dilutive effect of stock options and stock awards outstanding 871 962 1,012 1,170 Adjusted weighted average common shares outstanding (diluted) 51,869 51,077 51,699 50,883 Earnings per share attributable to common stockholders Basic $ 0.75 $ 0.62 $ 2.09 $ 1.50 Diluted $ 0.73 $ 0.61 $ 2.05 $ 1.46 Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive 3 - 107 94

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2019
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: September 30, 2019 December 31, 2018 Finished goods $ 59,721 $ 59,244 Work-in-progress 67,446 59,166 Raw materials 103,648 97,025 Total $ 230,815 $ 215,435

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Changes in Goodwill	The table below sets forth the changes in goodwill : Balance at December 31, 2018 $ 132,437 Acquisitions: Wafer fabrication facility in Greenock, Scotland (a) 931 Canyon investment (b) 1,671 ERIS investment in Yea-Shin (c) 4,320 Foreign currency translation adjustment (1,339 ) Balance at September 30, 2019 $ 138,020 The increase in goodwill is related to: (a) The Company’s acquisition accounting for the purchase of a wafer fabrication facility in Greenock, Scotland, (“GFAB”). (See Note 13 for additional information). (b) The Company’s acquisition accounting for the Company’s investment of $3.4 million in Canyon Semiconductor. This investment brings our ownership of Canyon to 51%. During the nine months ended September 30 2019, as a measurement period adjustment, we finalized our acquisition accounting with finalization of (c) The Company’s acquisition accounting related to Eris’ investment of approximately $6.4 million in Yea-Shin Technology Corporation. During the second quarter of 2019, as a measurement period adjustment, we increased goodwill approximately $4.3 million, related to finalization of deferred taxes. The Company owns approximately 51% of Eris and Eris owns approximately 60% of Yea-Shin.
Schedule of Intangible Assets Other Than Goodwill	The table below sets forth the value of intangible assets, other than goodwill: September 30, December 31, 2019 2018 Intangible assets subject to amortization: Gross carrying amount $ 244,554 $ 238,867 Accumulated amortization (119,949 ) (106,410 ) Foreign currency translation adjustment (8,271 ) (8,281 ) Total 116,334 124,176 Intangible assets with indefinite lives: Gross carrying amount 10,303 14,883 Foreign currency translation adjustment (1,191 ) (1,124 ) Total 9,112 13,759 Total intangible assets, net $ 125,446 $ 137,935
Schedule of Amortization Expense Related to Intangible Assets	The table below sets forth amortization expense related to intangible assets subject to amortization: Amortization expense 2019 2018 Three months ended September 30 $ 4,519 $ 4,418 Nine months ended September 30 $ 13,539 $ 13,863

Income Tax Provision (Tables)

Income Tax Provision (Tables)	9 Months Ended
	Sep. 30, 2019
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 Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Domestic pre-tax income (loss) $ 13,547 $ (7,267 ) $ 34,097 $ (11,289 ) Foreign pre-tax income $ 35,188 $ 51,667 $ 104,549 $ 118,412 Income tax provision $ 10,613 $ 13,190 $ 32,085 $ 31,726 Effective tax rate 21.8 % 29.7 % 23.1 % 29.6 % Impact of tax holidays on tax expense $ 330 $ 638 $ 1,179 $ (104 ) Earnings per share impact of tax holidays: Basic $ (0.01 ) $ (0.01 ) $ (0.02 ) $ - Diluted $ (0.01 ) $ (0.01 ) $ (0.02 ) $ -

Share-Based Compensation (Table

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
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 Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Cost of goods sold $ 281 $ 96 $ 665 $ 267 Selling, general and administrative 4,566 3,993 12,513 13,477 Research and development 742 807 2,186 2,233 Total share-based compensation expense $ 5,589 $ 4,896 $ 15,364 $ 15,977
Schedule of Share-Based Compensation Expense by Type	The table below sets forth share-based compensation expense by type: Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Stock options $ - $ - $ - $ 275 Share grants 5,589 4,896 15,364 15,702 Total share-based compensation expense $ 5,589 $ 4,896 $ 15,364 $ 15,977

Segment Information and Net S_2

Segment Information and Net Sales (Tables)	9 Months Ended
	Sep. 30, 2019
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 September 30, 2019 Asia North America Europe Consolidated Total sales $ 323,876 $ 175,900 $ 63,583 $ 563,359 Intercompany elimination (115,879 ) (96,150 ) (27,656 ) (239,685 ) Net sales $ 207,997 $ 79,750 $ 35,927 $ 323,674 Three Months Ended September 30, 2018 Asia North America Europe Consolidated Total sales $ 283,635 $ 51,640 $ 49,209 $ 384,484 Intercompany elimination (40,690 ) (8,773 ) (14,075 ) (63,538 ) Net sales $ 242,945 $ 42,867 $ 35,134 $ 320,946 As of and for the Nine Months Ended September 30, 2019 Asia North America Europe Consolidated Total sales $ 917,516 $ 450,874 $ 180,759 $ 1,549,149 Intercompany elimination (305,581 ) (228,344 ) (67,251 ) (601,176 ) Net sales $ 611,935 $ 222,530 $ 113,508 $ 947,973 Property, plant and equipment, net $ 385,862 $ 23,186 $ 59,074 $ 468,122 Total assets 1,173,683 237,467 198,663 $ 1,609,813 As of and for the Nine Months Ended September 30, 2018 Asia North America Europe Consolidated Total sales $ 797,455 $ 116,868 $ 150,382 $ 1,064,705 Intercompany elimination (106,330 ) (16,276 ) (42,556 ) (165,162 ) Net sales $ 691,125 $ 100,592 $ 107,826 $ 899,543 Property, plant and equipment, net $ 399,632 $ 30,133 $ 24,321 $ 454,086 Total assets $ 1,075,840 $ 202,024 $ 189,920 $ 1,467,784
Schedule of Net Sales by Direct Sales or Distributor and Location	The tables below set forth the amount of net sales by type ( direct sales or Distributor Net Sales for the Three Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China $ 57,952 $ 60,037 $ 105,305 $ 113,191 U.S. 2,388 4,409 20,723 30,550 Korea 6,546 4,597 10,594 13,250 Germany 3,079 3,076 16,705 20,912 Singapore 124 637 16,166 16,979 Taiwan 819 621 21,850 17,675 All others (1) 39,405 20,574 22,018 14,438 Total $ 110,313 $ 93,951 $ 213,361 $ 226,995 Percent of Net Sales by Type for the Three Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China 53 % 64 % 49 % 50 % U.S. 2 % 5 % 10 % 13 % Korea 6 % 5 % 5 % 6 % Germany 3 % 3 % 8 % 9 % Singapore — 1 % 8 % 7 % Taiwan 1 % 1 % 10 % 8 % All others (1) 35 % 21 % 10 % 7 % Total 100 % 100 % 100 % 100 % Total Net Sales for the Three Months Ended September 30, Dollars Percent of Net Sales 2019 2018 2019 2018 China $ 163,257 $ 173,228 50 % 54 % U.S. 23,111 34,959 7 % 11 % Korea 17,140 17,847 5 % 6 % Germany 19,784 23,988 6 % 7 % Singapore 16,290 17,616 5 % 5 % Taiwan 22,669 18,296 7 % 6 % All others (1) 61,423 35,012 20 % 11 % Total $ 323,674 $ 320,946 100 % 101 % Net Sales for the Nine Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China $ 169,861 $ 164,109 $ 305,197 $ 323,875 U.S. 8,509 12,866 78,693 78,081 Korea 17,309 12,148 27,588 32,163 Germany 9,536 9,001 53,355 63,343 Singapore 490 1,549 47,022 52,380 Taiwan 1,977 2,399 65,421 52,696 All others (1) 97,920 52,558 65,095 42,375 Total $ 305,602 $ 254,630 $ 642,371 $ 644,913 Percent of Net Sales by Type for the Nine Months Ended September 30, Direct Sales Distributor 2019 2018 2019 2018 China 56 % 64 % 48 % 50 % U.S. 3 % 5 % 12 % 12 % Korea 6 % 5 % 4 % 5 % Germany 3 % 4 % 8 % 10 % Singapore — 1 % 7 % 8 % Taiwan 1 % 1 % 10 % 8 % All others (1) 31 % 20 % 11 % 7 % Total 100 % 100 % 100 % 100 % Total Net Sales for the Nine Months Ended September 30, Dollar Percent of Net Sales 2019 2018 2019 2018 China $ 475,058 $ 487,984 50 % 54 % U.S. 87,202 90,947 9 % 10 % Korea 44,897 44,311 5 % 5 % Germany 62,891 72,344 7 % 8 % Singapore 47,512 53,929 5 % 6 % Taiwan 67,398 55,095 7 % 6 % All others (1) 163,015 94,933 17 % 11 % Total $ 947,973 $ 899,543 100 % 100 % (1) Represents countries with less than 3% of the total net sales each.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Outstanding Foreign Currency Forward Contracts	The table below sets forth outstanding foreign currency forward contracts at September 30, 2019 and December 31, 2018: Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 2,242 September 2019 November 2019 EUR/GBP 0.88592 Non-designated 2,785 September 2019 November 2019 EUR/USD 1.0939 Non-designated 21,195 September 2019 November 2019 GBP/USD 1.2328 Non-designated 39,681 September 2019 November 2019 USD/CNY 7.0985 Non-designated 806 September 2019 November 2019 USD/JPY 108.08 Non-designated 33,733 September 2019 November 2019 USD/TWD 30.925 Non-designated 500 January 2019 October 2019 USD/TWD 30.635 Non-designated 500 January 2019 January 2020 USD/TWD 30.635 Non-designated 500 January 2019 November 2019 USD/TWD 30.705 Non-designated $ 101,942 Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 1,221 December 2018 February 2019 EUR/GBP 0.8981 Non-designated 12,538 December 2018 February 2019 EUR/USD 1.1479 Non-designated 8,463 December 2018 February 2019 GBP/USD 1.2785 Non-designated 44,946 December 2018 February 2019 USD/CNY 6.8738 Non-designated 844 December 2018 February 2019 USD/JPY 110.14 Non-designated 54,041 December 2018 February 2019 USD/TWD 30.559 Non-designated 300 December 2018 January 2019 USD/TWD 30.669 Non-designated $ 122,353 * EUR = Euro GBP = British Pound Sterling USD = United States Dollar CNY = Chinese Yuan Renminbi JPY = Japan Yen TWD = Taiwan dollar
Summary of Information Related to Number of and Notional Amount of Interest Rate Related Derivative Instruments	Hedges of Interest Rate and Net Investment Risk - The Company’s objective in using interest rate swaps and collars is to minimize the risks associated with its floating rate debt. The Company makes use of cross currency swaps to decrease the foreign exchange risk inherent in the Company’s investment in its foreign subsidiaries. Number of Instruments Notional Amount September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 Interest rate swaps and collars 10 12 $ 200,000 $ 210,000
Summary of Fair Value of Derivative Financial Instruments, Excluding Adjustments for Performance Risk and Their Classification on Condensed Consolidated Balance Sheets	The table below sets forth the fair value of the Company’s derivative financial instruments, excluding adjustments for performance risk, if any, as well as their classification on our condensed consolidated balance sheets: Other Current Assets Other Assets Other Current Liabilities Other Liabilities September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 September 30, 2019 December 31, 2018 Interest rate swaps and collars $ 299 $ 1,936 $ 0 $ 2,795 $ 57 $ - $ 407 $ -
Summary of Effect of Derivative Financial Instruments on the Condensed Consolidated Statements of Operations	The tables below sets forth the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the three and nine months ended September 30, 2019 and 2018: 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 September 30, September 30, September 30, 2019 2018 2019 2018 2019 2018 Three Months Ended Interest rate swaps and collars $ (136 ) $ 636 Interest expense $ 224 $ 299 N/A - - Cross currency swaps $ - $ - N/A - - Interest income - - Nine Months Ended Interest rate swaps and collars $ (3,145 ) $ 4,143 Interest expense $ 1,149 $ 526 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 September 30, 2019 2018 Three Months Ended Foreign currency forward contracts $ (2,563 ) $ (2,200 ) Foreign currency loss, net Nine Months Ended Foreign currency forward contracts $ (3,793 ) $ (7,570 ) Foreign currency loss, net

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Components of Lease Expense	The components of lease expense are set forth in the table below: Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Operating lease expense $ 3,671 $ 11,148 Finance lease expense: Amortization of assets 244 733 Interest on lease liabilities 11 39 Short-term lease expense 89 223 Variable lease expense 681 2,101 Total lease expense $ 4,696 $ 14,244
Supplemental Balance Sheet Information Related to Leases	The table below sets forth supplemental balance sheet information related to leases: September 30, 2019 Operating leases: Operating lease ROU assets $60,217 Current operating lease liabilities 12,235 Noncurrent operating lease liabilities 29,920 Total operating lease liabilities $42,155 Finance leases: Finance lease ROU assets $3,396 Accumulated amortization (1,680) Finance lease ROU assets, net $1,716 Current finance lease liabilities $896 Non-current finance lease liabilities 367 Total finance lease liabilities $1,263 Weighted average remaining lease term (in years): Operating leases 4.6 Finance leases 1.5 Weighted average discount rate: Operating leases 3.8% Finance leases 3.6%
Supplemental Cash Flow and Other Information Related to Leases	The table below sets forth supplemental cash flow and other information related to leases: Nine Months Ended September 30, 2019 Cash paid for the amounts included in the measurements of lease liabilities: Operating cash outflows from operating leases $14,728 Operating cash outflows from finance leases 39 Financing cash outflow from finance leases 912 ROU assets obtained in exchange for lease liabilities incurred: Operating leases 3,611
Schedule of Operating and Finance Lease Liability Maturities	The table below sets forth information about lease liability maturities: September 30, 2019 Operating Leases Finance Leases Remainder of 2019 $ 3,535 $ 230 2020 13,410 922 2021 9,476 139 2022 8,028 - 2023 4,437 - 2024 2,370 - 2025 and thereafter 4,785 - Total lease payments 46,041 1,291 Less: imputed interest (3,886) (28) Total lease obligations 42,155 1,263 Less: current obligations (12,235) (896) Long-term lease obligations $ 29,920 $ 367

Related Parties (Tables)

Related Parties (Tables)	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
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 Nine Months Ended September 30, September 30, 2019 2018 2019 2018 LSC Net sales $ 273 $ 304 $ 729 $ 896 Purchases $ 2,548 $ 5,208 $ 11,039 $ 16,630 Nuvoton Purchases $ 2,650 $ 2,361 $ 5,951 $ 7,774 Keylink Net sales $ 4,923 $ 4,684 $ 11,304 $ 8,762 Purchases $ 604 $ 907 $ 1,794 $ 2,646 JCP Purchases $ 151 $ 201 $ 462 $ 488
Schedule of Account Receivable and Payable of Related Party Transactions	The table below sets forth accounts receivable from, and accounts payable to, related parties: September 30, December 31, 2019 2018 LSC Accounts receivable $ 337 $ 286 Accounts payable $ 1,749 $ 2,696 Nuvoton Accounts payable $ 1,238 $ 1,939 Keylink Accounts receivable $ 15,004 $ 6,264 Accounts payable $ 11,597 $ 4,656 JCP Accounts payable $ 206 $ 151

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2019
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

Nature of Operations, Basis o_3

Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies and Estimates - Additional Information (Details) - ASU 2016-02 $ in Millions	Jan. 01, 2019USD ($)
Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies [Line Items]
ROU assets	$ 68.3
ROU liabilities	50.4
Land-use Rights | Other Assets
Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies [Line Items]
ROU assets	17.1
Land-use Rights | Property, Plant and Equipment
Nature of Operations, Basis of Presentation, Recently Issued Accounting Pronouncements and Updates to Accounting Policies [Line Items]
ROU assets	$ 2.5

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
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 o

Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings (numerator)
Net income attributable to common stockholders	$ 38,060	$ 30,908	$ 106,060	$ 74,502
Shares (denominator)
Weighted average common shares outstanding (basic)	50,998	50,115	50,687	49,713
Dilutive effect of stock options and stock awards outstanding	871	962	1,012	1,170
Adjusted weighted average common shares outstanding (diluted)	51,869	51,077	51,699	50,883
Earnings per share attributable to common stockholders
Basic	$ 0.75	$ 0.62	$ 2.09	$ 1.50
Diluted	$ 0.73	$ 0.61	$ 2.05	$ 1.46
Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive	3		107	94

Inventories - Schedule of Inven

Inventories - Schedule of Inventory Current (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished goods	$ 59,721	$ 59,244
Work-in-progress	67,446	59,166
Raw materials	103,648	97,025
Total	$ 230,815	$ 215,435

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Goodwill
Goodwill beginning balance	$ 132,437
Foreign currency translation adjustment	(1,339)
Goodwill ending balance	138,020
Wafer Fabrication Facility in Greenock, Scotland
Goodwill
Acquisitions	931	[1]
Canyon Investment
Goodwill
Acquisitions	1,671	[2]
ERIS Investment in Yea-Shin
Goodwill
Acquisitions	$ 4,320	[3]
[1]	The Company’s acquisition accounting for the purchase of a wafer fabrication facility in Greenock, Scotland, (“GFAB”).  (See Note 13 for additional information).
[2]	The Company’s acquisition accounting for the Company’s investment of $3.4 million in Canyon Semiconductor. This investment brings our ownership of Canyon to 51%. During the nine months ended September 30 2019, as a measurement period adjustment, we finalized our acquisition accounting with finalization of
[3]	The Company’s acquisition accounting related to Eris’ investment of approximately $6.4 million in Yea-Shin Technology Corporation.  During the second quarter of 2019, as a measurement period adjustment, we increased goodwill approximately $4.3 million, related to finalization of deferred taxes. The Company owns approximately 51% of Eris and Eris owns approximately 60% of Yea-Shin.

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019
Canyon Semiconductor
Goodwill [Line Items]
Accounting allocation of investment		$ 3.4
Canyon
Goodwill [Line Items]
Percentage of ownership		51.00%
ERIS Technology Corporation | Yea-Shin Technology Corporation
Goodwill [Line Items]
Accounting allocation of investment		$ 6.4
Percentage of ownership		51.00%
Yea-Shin Technology Corporation | ERIS Technology Corporation
Goodwill [Line Items]
Percentage of ownership		60.00%
Finalization of Deferred Taxes
Goodwill [Line Items]
Measurement period adjustment in amount of goodwill	$ 4.3

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Intangible assets subject to amortization
Gross carrying amount	$ 244,554	$ 238,867
Accumulated amortization	(119,949)	(106,410)
Foreign currency translation adjustment	(8,271)	(8,281)
Total	116,334	124,176
Intangible assets with indefinite lives
Gross carrying amount	10,303	14,883
Foreign currency translation adjustment	(1,191)	(1,124)
Total	9,112	13,759
Total intangible assets, net	$ 125,446	$ 137,935

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Amortization Expense Related to Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 4,519	$ 4,418	$ 13,539	$ 13,863

Income Tax Provision - Schedule

Income Tax Provision - Schedule of Information Related to Income Tax Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Domestic pre-tax income (loss)	$ 13,547	$ (7,267)	$ 34,097	$ (11,289)
Foreign pre-tax income	35,188	51,667	104,549	118,412
Income tax provision	$ 10,613	$ 13,190	$ 32,085	$ 31,726
Effective tax rate	21.80%	29.70%	23.10%	29.60%
Impact of tax holidays on tax expense	$ 330	$ 638	$ 1,179	$ (104)
Earnings per share impact of tax holidays:
Basic	$ (0.01)	$ (0.01)	$ (0.02)
Diluted	$ (0.01)	$ (0.01)	$ (0.02)

Income Tax Provision - Addition

Income Tax Provision - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 33.8
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 2009. 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 2013. 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 - Sche

Share-Based Compensation - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 5,589	$ 4,896	$ 15,364	$ 15,977
Cost of Goods Sold
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	281	96	665	267
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	4,566	3,993	12,513	13,477
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 742	$ 807	$ 2,186	$ 2,233

Share-Based Compensation - Sc_2

Share-Based Compensation - Schedule of Share-Based Compensation Expense by Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 5,589	$ 4,896	$ 15,364	$ 15,977
Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense				275
Share Grants
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 5,589	$ 4,896	$ 15,364	$ 15,702

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash proceeds received from stock option exercises	$ 7,200,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized	$ 0
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
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized	$ 44,400,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition	2 years 3 months 18 days

Segment Information and Net S_3

Segment Information and Net Sales - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)Customer	Sep. 30, 2019USD ($)Customer	Sep. 30, 2018USD ($)Customer
Entity Wide Revenue Major Customer [Line Items]
Number of customer accounted for 10.2% or 32.7 million of net sales		1
Percentage of net sales	100.00%	101.00%	100.00%	100.00%
Concentration risk, net sales amount | $	$ 323,674	$ 320,946	$ 947,973	$ 899,543
Number of customer did not account for or greater of outstanding accounts receivable			0	0
Number of customer did not account for 10% or greater of net revenue			0	0
Geographic Concentration Risk
Entity Wide Revenue Major Customer [Line Items]
Percentage of net sales		10.20%	10.00%
Concentration risk, net sales amount | $		$ 32,700

Segment Information and Net S_4

Segment Information and Net Sales - Schedule of Net Sales from Based on Location of the Subsidiary (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 323,674	$ 320,946	$ 947,973	$ 899,543
Property, plant and equipment, net	468,122	454,086	468,122	454,086	$ 446,835
Total assets	1,609,813	1,467,784	1,609,813	1,467,784	$ 1,526,371
Operating Segments
Segment Reporting Information [Line Items]
Net sales	563,359	384,484	1,549,149	1,064,705
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(239,685)	(63,538)	(601,176)	(165,162)
Asia
Segment Reporting Information [Line Items]
Net sales	207,997	242,945	611,935	691,125
Property, plant and equipment, net	385,862	399,632	385,862	399,632
Total assets	1,173,683	1,075,840	1,173,683	1,075,840
Asia | Operating Segments
Segment Reporting Information [Line Items]
Net sales	323,876	283,635	917,516	797,455
Asia | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(115,879)	(40,690)	(305,581)	(106,330)
North America
Segment Reporting Information [Line Items]
Net sales	79,750	42,867	222,530	100,592
Property, plant and equipment, net	23,186	30,133	23,186	30,133
Total assets	237,467	202,024	237,467	202,024
North America | Operating Segments
Segment Reporting Information [Line Items]
Net sales	175,900	51,640	450,874	116,868
North America | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(96,150)	(8,773)	(228,344)	(16,276)
Europe
Segment Reporting Information [Line Items]
Net sales	35,927	35,134	113,508	107,826
Property, plant and equipment, net	59,074	24,321	59,074	24,321
Total assets	198,663	189,920	198,663	189,920
Europe | Operating Segments
Segment Reporting Information [Line Items]
Net sales	63,583	49,209	180,759	150,382
Europe | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (27,656)	$ (14,075)	$ (67,251)	$ (42,556)

Segment Information and Net S_5

Segment Information and Net Sales - Schedule of Net Sales by Direct Sales or Distributor and Location (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 323,674	$ 320,946	$ 947,973	$ 899,543
Percentage of net sales		100.00%	101.00%	100.00%	100.00%
Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 110,313	$ 93,951	$ 305,602	$ 254,630
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 213,361	$ 226,995	$ 642,371	$ 644,913
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
China
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 163,257	$ 173,228	$ 475,058	$ 487,984
Percentage of net sales		50.00%	54.00%	50.00%	54.00%
China | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 57,952	$ 60,037	$ 169,861	$ 164,109
Percentage of net sales		53.00%	64.00%	56.00%	64.00%
China | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 105,305	$ 113,191	$ 305,197	$ 323,875
Percentage of net sales		49.00%	50.00%	48.00%	50.00%
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 23,111	$ 34,959	$ 87,202	$ 90,947
Percentage of net sales		7.00%	11.00%	9.00%	10.00%
United States | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 2,388	$ 4,409	$ 8,509	$ 12,866
Percentage of net sales		2.00%	5.00%	3.00%	5.00%
United States | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 20,723	$ 30,550	$ 78,693	$ 78,081
Percentage of net sales		10.00%	13.00%	12.00%	12.00%
Korea
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 17,140	$ 17,847	$ 44,897	$ 44,311
Percentage of net sales		5.00%	6.00%	5.00%	5.00%
Korea | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 6,546	$ 4,597	$ 17,309	$ 12,148
Percentage of net sales		6.00%	5.00%	6.00%	5.00%
Korea | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 10,594	$ 13,250	$ 27,588	$ 32,163
Percentage of net sales		5.00%	6.00%	4.00%	5.00%
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 19,784	$ 23,988	$ 62,891	$ 72,344
Percentage of net sales		6.00%	7.00%	7.00%	8.00%
Germany | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 3,079	$ 3,076	$ 9,536	$ 9,001
Percentage of net sales		3.00%	3.00%	3.00%	4.00%
Germany | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,705	$ 20,912	$ 53,355	$ 63,343
Percentage of net sales		8.00%	9.00%	8.00%	10.00%
Singapore
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,290	$ 17,616	$ 47,512	$ 53,929
Percentage of net sales		5.00%	5.00%	5.00%	6.00%
Singapore | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 124	$ 637	$ 490	$ 1,549
Percentage of net sales			1.00%		1.00%
Singapore | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,166	$ 16,979	$ 47,022	$ 52,380
Percentage of net sales		8.00%	7.00%	7.00%	8.00%
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 22,669	$ 18,296	$ 67,398	$ 55,095
Percentage of net sales		7.00%	6.00%	7.00%	6.00%
Taiwan | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 819	$ 621	$ 1,977	$ 2,399
Percentage of net sales		1.00%	1.00%	1.00%	1.00%
Taiwan | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 21,850	$ 17,675	$ 65,421	$ 52,696
Percentage of net sales		10.00%	8.00%	10.00%	8.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 61,423	$ 35,012	$ 163,015	$ 94,933
Percentage of net sales	[1]	20.00%	11.00%	17.00%	11.00%
All Others | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 39,405	$ 20,574	$ 97,920	$ 52,558
Percentage of net sales	[1]	35.00%	21.00%	31.00%	20.00%
All Others | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 22,018	$ 14,438	$ 65,095	$ 42,375
Percentage of net sales	[1]	10.00%	7.00%	11.00%	7.00%
[1]	Represents countries with less than 3% of the total net sales each.

Segment Information and Net S_6

Segment Information and Net Sales - Schedule of Net Sales by Direct Sales or Distributor and Location (Parenthetical) (Details)		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales		100.00%	101.00%	100.00%	100.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales	[1]	20.00%	11.00%	17.00%	11.00%
All Others | Maximum
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales		3.00%	3.00%	3.00%	3.00%
[1]	Represents countries with less than 3% of the total net sales each.

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) £ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)$ / £	Sep. 30, 2019GBP (£)$ / £
Commitments And Contingencies [Line Items]
Purchase Commitments	$ 26.1
Long-term purchase commitment, Amount	$ 72.7
Pension Plan, Defined Benefit
Commitments And Contingencies [Line Items]
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 September 30, 2019, the unfunded liability for this defined benefit plan was approximately $33.0 million.  We are obligated to make annual contributions, each year through December 2029, of approximately GBP 2 million (approximately $2.6  million based on a GBP: USD exchange rate of 1.3:1).  It is necessary for the Trustees to review the contributions required to fund the benefits promised to the employees at least every three years.  A review as of April 2019 is underway and the outcome of the review could result in a change in the amount of the payment or the period over which payment is required.
Defined benefit plan, expected future benefit payments in year one	$ 2.6	£ 2
Defined benefit plan, expected future benefit payments in year two	2.6	2
Defined benefit plan, expected future benefit payments in year three	2.6	2
Defined benefit plan, expected future benefit payments in year four	2.6	2
Defined benefit plan, expected future benefit payments in year five	2.6	2
Defined benefit plan, expected future benefit payments in eight fiscal years thereafter	$ 2.6	£ 2
GBP:USD exchange rate | $ / £	1.3	1.3
Unfunded liability of defined benefit plan	$ 33

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Objectives for using derivative instruments	The Company’s objective in using interest rate swaps and collars is to minimize the risks associated with its floating rate debt. The Company makes use of cross currency swaps to decrease the foreign exchange risk inherent in the Company’s investment in its foreign subsidiaries.
Net derivative gain will be reclassified from AOCI into net income	$ 200,000
Posted collateral related to agreements	0	$ 0
Foreign Currency Forward Contracts
Derivative [Line Items]
Fair value of foreign exchange hedges	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Outstanding Foreign Currency Forward Contracts (Details) - Foreign Currency Forward Contracts - Cash Flow Hedges - Non-designated	9 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)€ / £€ / $£ / $$ / ¥$ / ¥$ / $	Dec. 31, 2018USD ($)€ / £€ / $£ / $$ / ¥$ / ¥$ / $
Derivative [Line Items]
Notional Amount	$ 101,942,000	$ 122,353,000
Derivative One
Derivative [Line Items]
Notional Amount	$ 2,242,000	$ 1,221,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	EUR/GBP	EUR/GBP
Weighted Average Foreign Exchange Rate | € / £	0.88592	0.8981
Derivative Two
Derivative [Line Items]
Notional Amount	$ 2,785,000	$ 12,538,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	EUR/USD	EUR/USD
Weighted Average Foreign Exchange Rate | € / $	1.0939	1.1479
Derivative Three
Derivative [Line Items]
Notional Amount	$ 21,195,000	$ 8,463,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	GBP/USD	GBP/USD
Weighted Average Foreign Exchange Rate | £ / $	1.2328	1.2785
Derivative Four
Derivative [Line Items]
Notional Amount	$ 39,681,000	$ 44,946,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	USD/CNY	USD/CNY
Weighted Average Foreign Exchange Rate | $ / ¥	7.0985	6.8738
Derivative Five
Derivative [Line Items]
Notional Amount	$ 806,000	$ 844,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	USD/JPY	USD/JPY
Weighted Average Foreign Exchange Rate | $ / ¥	108.08	110.14
Derivative Six
Derivative [Line Items]
Notional Amount	$ 33,733,000	$ 54,041,000
Effective Date	Sep. 30, 2019	Dec. 31, 2018
Maturity Date	Nov. 30, 2019	Feb. 28, 2019
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.925	30.559
Derivative Seven
Derivative [Line Items]
Notional Amount	$ 500,000	$ 300,000
Effective Date	Jan. 31, 2019	Dec. 31, 2018
Maturity Date	Oct. 31, 2019	Jan. 31, 2019
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.635	30.669
Derivative Eight
Derivative [Line Items]
Notional Amount	$ 500,000
Effective Date	Jan. 31, 2019
Maturity Date	Jan. 31, 2020
Index	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.635
Derivative Nine
Derivative [Line Items]
Notional Amount	$ 500,000
Effective Date	Jan. 31, 2019
Maturity Date	Nov. 30, 2019
Index	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.705

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Information Related to Number of and Notional Amount of Interest Rate Related Derivative Instruments (Details) - Designated as Hedging Instrument - Interest Rate Swaps and Collars	Sep. 30, 2019USD ($)DerivativeInstrument	Dec. 31, 2018USD ($)DerivativeInstrument
Derivative [Line Items]
Number of Instruments | DerivativeInstrument	10	12
Notional Amount | $	$ 200,000,000	$ 210,000,000

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments, Excluding Adjustments for Performance Risk and Their Classification on Condensed Consolidated Balance Sheets (Details) - Interest Rate Swaps and Collars - Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Current Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives	$ 299	$ 1,936
Other Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives	0	$ 2,795
Other Current Liabilities
Derivative [Line Items]
Fair value of derivative instruments, liability derivatives	57
Other Liabilities
Derivative [Line Items]
Fair value of derivative instruments, liability derivatives	$ 407

Derivative Financial Instrume_7

Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on the Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
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	$ (136)	$ 636	$ (3,145)	$ 4,143
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	$ 224	299	$ 1,149	526
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			$ (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)			$ 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	$ (2,563)	$ (2,200)	$ (3,793)	$ (7,570)
Location of Gain or (Loss) Recognized in Net Income	Foreign currency loss, net		Foreign currency loss, net

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 3,671	$ 11,148
Finance lease expense:
Amortization of assets	244	733
Interest on lease liabilities	11	39
Short-term lease expense	89	223
Variable lease expense	681	2,101
Total lease expense	$ 4,696	$ 14,244

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Details) $ in Thousands	Sep. 30, 2019USD ($)
Operating leases:
Operating lease ROU assets	$ 60,217
Current operating lease liabilities	12,235
Noncurrent operating lease liabilities	29,920
Total operating lease liabilities	42,155
Finance leases:
Finance lease ROU assets	3,396
Accumulated amortization	(1,680)
Finance lease ROU assets, net	1,716
Current finance lease liabilities	896
Non-current finance lease liabilities	367
Total finance lease liabilities	$ 1,263
Weighted average remaining lease term (in years):
Operating leases	4 years 7 months 6 days
Finance leases	1 year 6 months
Weighted average discount rate:
Operating leases	3.80%
Finance leases	3.60%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow and Other Information Related to Leases (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Cash paid for the amounts included in the measurements of lease liabilities:
Operating cash outflows from operating leases	$ 14,728
Operating cash outflows from finance leases	39
Financing cash outflow from finance leases	912
ROU assets obtained in exchange for lease liabilities incurred:
Operating leases	$ 3,611

Leases - Schedule of Operating

Leases - Schedule of Operating and Finance Lease Liability Maturities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating Leases, Remainder of 2019	$ 3,535
Operating Leases, 2020	13,410
Operating Leases, 2021	9,476
Operating Leases, 2022	8,028
Operating Leases, 2023	4,437
Operating Leases, 2024	2,370
Operating Leases, 2025 and thereafter	4,785
Operating Leases, Total lease payments	46,041
Operating Leases, Less: imputed interest	(3,886)
Total operating lease liabilities	42,155
Operating Leases, Less: current obligations	(12,235)
Noncurrent operating lease liabilities	29,920
Finance Leases, Remainder of 2019	230
Finance Leases, 2020	922
Finance Leases, 2021	139
Finance Leases, Total lease payments	1,291
Finance Leases, Less: imputed interest	(28)
Total finance lease liabilities	1,263
Finance Leases, Less: current obligations	(896)
Non-current finance lease liabilities	$ 367

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Details) - Deferred Compensation Plan - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
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 by investing in the actual underlying investments. These investments are classified as trading securities and are carried at fair value. At September 30, 2019 and December 31, 2018, these investments totaled approximately $11.5 million and $10.6 million, respectively. All gains and losses in these investments are materially offset by corresponding gains and losses in the Deferred Compensation Plan liabilities.
Deferred compensation plan assets	$ 11.5	$ 10.6

Related Parties - Additional In

Related Parties - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
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 September 30, 2019, and is a member of the Lite-On Group of companies.
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	$ 3.7	$ 3.8	$ 11.5	$ 12.6
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 N

Related Parties - Schedule of Net Sales and Purchases of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lite On Semiconductor
Related Party Transaction [Line Items]
Net sales from related parties	$ 273	$ 304	$ 729	$ 896
Purchases from related parties	2,548	5,208	11,039	16,630
Nuvoton
Related Party Transaction [Line Items]
Purchases from related parties	2,650	2,361	5,951	7,774
Keylink
Related Party Transaction [Line Items]
Net sales from related parties	4,923	4,684	11,304	8,762
Purchases from related parties	604	907	1,794	2,646
JCP
Related Party Transaction [Line Items]
Purchases from related parties	$ 151	$ 201	$ 462	$ 488

Related Parties - Schedule of A

Related Parties - Schedule of Account Receivable and Payable of Related Party Transactions (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Lite On Semiconductor
Related Party Transaction [Line Items]
Accounts receivable	$ 337	$ 286
Accounts payable	1,749	2,696
Nuvoton
Related Party Transaction [Line Items]
Accounts payable	1,238	1,939
Keylink
Related Party Transaction [Line Items]
Accounts receivable	15,004	6,264
Accounts payable	11,597	4,656
JCP
Related Party Transaction [Line Items]
Accounts payable	$ 206	$ 151

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ in Millions	Aug. 08, 2019	Apr. 01, 2019
Wafer Fabrication Facility ("GFAB")
Business Acquisition [Line Items]
Acquisition date		Apr. 1, 2019
Accounting allocation of investment		$ 33.2
Wafer Fabrication Facility ("GFAB") | Selling, General and Administrative
Business Acquisition [Line Items]
Acquisition costs		$ 0.6
LSC Acquisition
Business Acquisition [Line Items]
Business acquisition, share swap agreement date	Aug. 8, 2019
Cash payments to acquire business	$ 428

Acquisitions - Summary of Fair

Acquisitions - Summary of Fair Value of Assets and Liabilities Related to Acquisition Recorded in Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 138,020		$ 132,437
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

Assets Held for Sale - Addition

Assets Held for Sale - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019USD ($)a
Long Lived Assets Held For Sale [Line Items]
Impairment charges | $	$ 0
Plano, Texas
Long Lived Assets Held For Sale [Line Items]
Land held for sale | a	16