Diodes (DIOD) 10-Q 6 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Document And Entity Information [Abstract]
Document type	10-Q
Document period end date	Sep. 30, 2018
Amendment flag	false
Entity registrant name	DIODES INC /DEL/
Entity central index key	29,002
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		50,220,853
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	DIOD

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 150,274	$ 203,820
Short-term investments	7,280	4,558
Accounts receivable, net of allowances of $3,480 and $4,480 at September 30, 2018 and December 31, 2017, respectively	228,065	200,112
Inventories	219,146	216,506
Prepaid expenses and other	42,804	37,328
Total current assets	647,569	662,324
Property, plant and equipment, net	454,086	459,169
Deferred income tax	44,000	40,580
Goodwill	132,910	134,187
Intangible assets, net	142,487	156,445
Other	46,732	35,968
Total assets	1,467,784	1,488,673
Current liabilities:
Line of credit	12,283	1,008
Accounts payable	117,118	108,001
Accrued liabilities and other	92,039	99,301
Income tax payable	14,145	18,216
Current portion of long-term debt	26,285	20,636
Total current liabilities	261,870	247,162
Long-term debt, net of current portion	139,987	247,492
Deferred tax liabilities	26,308	25,176
Other long-term liabilities	87,168	94,925
Total liabilities	515,333	614,755
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; 50,190,959 and 49,130,090, issued and outstanding at September 30, 2018 and December 31, 2017, respectively	34,433	33,727
Additional paid-in capital	395,412	386,338
Retained earnings	607,189	532,687
Treasury stock, at cost, 1,457,206 shares held at September 30, 2018 and December 31, 2017	(37,768)	(37,768)
Accumulated other comprehensive loss	(91,598)	(83,480)
Total stockholders' equity	907,668	831,504
Noncontrolling interest	44,783	42,414
Total equity	952,451	873,918
Total liabilities and stockholders' equity	$ 1,467,784	$ 1,488,673

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 3,480	$ 4,480
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	50,190,959	49,130,090
Common stock shares outstanding	50,190,959	49,130,090
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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 320,946	$ 285,247	$ 899,543	$ 785,774
Cost of goods sold	205,732	188,900	578,466	525,377
Gross profit	115,214	96,347	321,077	260,397
Operating expenses
Selling, general and administrative	42,475	43,525	131,778	122,912
Research and development	22,549	20,379	64,799	58,215
Amortization of acquisition related intangible assets	4,418	4,694	13,863	14,098
Impairment of fixed assets		1,993		1,993
Restructuring		2,039	206	6,108
Other operating (income) expense	(66)		(191)	169
Total operating expense	69,376	72,630	210,455	203,495
Income from operations	45,838	23,717	110,622	56,902
Other income (expense)
Interest income	474	389	1,431	992
Interest expense	(2,318)	(3,561)	(7,619)	(10,493)
Foreign currency loss, net	(655)	(1,312)	(3,384)	(6,734)
Other income	1,061	597	6,073	1,128
Total other expense	(1,438)	(3,887)	(3,499)	(15,107)
Income before income taxes and noncontrolling interest	44,400	19,830	107,123	41,795
Income tax provision	13,190	5,052	31,726	11,651
Net income	31,210	14,778	75,397	30,144
Less net income attributable to noncontrolling interest	(302)	(328)	(895)	(1,298)
Net income attributable to common stockholders	$ 30,908	$ 14,450	$ 74,502	$ 28,846
Earnings per share attributable to common stockholders:
Basic	$ 0.62	$ 0.29	$ 1.50	$ 0.59
Diluted	$ 0.61	$ 0.29	$ 1.46	$ 0.58
Number of shares used in earnings per share computation:
Basic	50,115	49,057	49,713	48,633
Diluted	51,077	50,416	50,883	50,061

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest [Abstract]
Net income	$ 31,210	$ 14,778	$ 75,397	$ 30,144
Unrealized (loss) gain on defined benefit plan, net of tax	(493)	(1,135)	7,208	(2,517)
Unrealized gain on interest rate swap, net of tax	378	180	3,653	60
Unrealized foreign currency (loss) gain, net of tax	(9,848)	8,249	(18,978)	25,416
Comprehensive income	21,247	22,072	67,280	53,103
Less: Comprehensive income attributable to noncontrolling interest	(302)	(328)	(895)	(1,298)
Total comprehensive income attributable to common stockholders	$ 20,945	$ 21,744	$ 66,385	$ 51,805

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Cash flows from operating activities	$ 123,928	$ 106,340
Cash flows from investing activities
Acquisition net of cash acquired	(41)
Purchases of property, plant and equipment	(72,159)	(81,877)
Purchases of short-term investments	(13,959)	(9,744)
Proceeds from maturity of short-term investments	10,831	27,891
Other	1,235	(1,238)
Net cash and cash equivalents used in investing activities	(74,093)	(64,968)
Cash flows from financing activities
Advances on lines of credit and short-term debt	9,151	2,383
Taxes paid related to net share settlement	(11,056)	(277)
Proceeds from long-term debt	304,656	7,500
Repayments of long-term debt	(408,863)	(109,607)
Net proceeds from issuance of common stock	4,861	6,880
Proceeds from capital lease obligation	1,489
Repayment of capital lease obligation		(533)
Dividend distribution to noncontrolling interest	(2,694)	(5,754)
Capital contribution from noncontrolling interest	5,263
Other	(764)	1,562
Net cash and cash equivalents used in financing activities	(97,957)	(97,846)
Effect of exchange rate changes on cash and cash equivalents	(6,039)	9,415
Change in cash and cash equivalents, including restricted cash	(54,161)	(47,059)
Cash and cash equivalents, beginning of period, including restricted cash	205,262	249,712
Cash and cash equivalents, end of period, including restricted cash	151,101	202,653
Supplemental Cash Flow Information
Interest	7,661	10,063
Taxes	29,435	28,808
Non-cash investing and financing activities:
Decrease/(increase) in accounts payable related to the purchase of property, plant and equipment	$ 8,093	(10,919)
Noncontrolling Interest
Non-cash investing and financing activities:
Increase in dividend accrued for noncontrolling interest		$ 1,000

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 150,274	$ 201,226
Restricted cash (included in other current assets)	827	1,427
Total cash, cash equivalents and restricted cash	$ 151,101	$ 202,653

Nature of Operations, Basis of

Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements	9 Months Ended
	Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements	NOTE 1 – Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements 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. Our corporate headquarters and Americas’ sales office 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; Manchester, England; and Neuhaus, Germany. Our wafer fabrication facilities are located in Manchester and in Shanghai, China. 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; Manchester; Shanghai; Shenzhen, Yangzhou, China; Seongnam-si, South Korea; and Munich, Germany; and Tokyo, Japan, with support offices throughout the world. Basis of Presentation The condensed consolidated financial data at December 31, 2017 is derived from audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 filed with the Securities and Exchange Commission (“SEC”) on February 20, 2018 (“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, 2018 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2018. 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 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. 2014-09, Revenue from Contracts with Customers (Topic 606) - ASU No. 2016-18, Statement of Cash Flows – Restricted Cash (Topic 230) Standards Effective in Future Years ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”) - The ASU will become effective for the Company for interim and annual reporting periods in fiscal years beginning after December 15, 2018. The standard offers a number of practical expedients for transition and certain expedients specific to lessees or lessors. Both lessees and lessors are permitted to make an election to apply a package of practical expedients available for implementation under the standard. For transition, the Company will recognize all effects of transition in the beginning of the adoption reporting period on January 1, 2019. We do not expect to elect the use-of-hindsight or land easement practical expedients, the latter not being applicable to us. The Company will continue its implementation work of ASU 2016-02 in 2018, including enhancements to the Company’s internal control framework, accounting systems and related documentation surrounding its lease accounting processes and the preparation of any additional disclosures that will be required. ASU 2018-10, Codification Improvements to Topic 842, Leases (“ASU 2016-02”) - ASU 2018-11, Leases (Topic 842): Targeted Improvements (“ASU 2018-11”) - The Company will adopt this standard on January 1, 2019. ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting ("ASU 2018-07") - ASU 2018-13, Changes to Disclosure Requirements for Fair Value Measurements (“ASU 2018-13”) - ASU 2018-14, Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans ("ASU No. 2018-14").

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
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. 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, 2018 2017 2018 2017 Earnings (numerator) Net income attributable to common stockholders $ 30,908 $ 14,450 $ 74,502 $ 28,846 Shares (denominator) Weighted average common shares outstanding (basic) 50,115 49,057 49,713 48,633 Dilutive effect of stock options and stock awards outstanding 962 1,359 1,170 1,428 Adjusted weighted average common shares outstanding (diluted) 51,077 50,416 50,883 50,061 Earnings per share attributable to common stockholders Basic $ 0.62 $ 0.29 $ 1.50 $ 0.59 Diluted $ 0.61 $ 0.29 $ 1.46 $ 0.58 Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive - 651 94 704

Inventories

Inventories	9 Months Ended
	Sep. 30, 2018
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, 2018 December 31, 2017 Finished goods $ 62,004 $ 81,194 Work-in-progress 57,504 52,578 Raw materials 99,638 82,734 Total $ 219,146 $ 216,506

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2018
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, 2017 $ 134,187 ERIS acquisition of Yea Shin Technology Corporation 559 Foreign currency translation adjustment (1,836 ) Balance at September 30, 2018 $ 132,910 The table below sets forth the value of intangible assets, other than goodwill: September 30, December 31, 2018 2017 Intangible assets subject to amortization: Gross carrying amount $ 238,867 $ 234,533 Accumulated amortization (101,923 ) (88,059 ) Foreign currency translation adjustment (8,265 ) (8,249 ) Total 128,679 138,225 Intangible assets with indefinite lives: Gross carrying amount 14,883 19,217 Foreign currency translation adjustment (1,075 ) (997 ) Total 13,808 18,220 Total intangible assets, net $ 142,487 $ 156,445 The table below sets forth amortization expense related to intangible assets subject to amortization: Amortization expense 2018 2017 Three months ended September 30 $ 4,418 $ 4,694 Nine months ended September 30 $ 13,863 $ 14,098

Income Tax Provision

Income Tax Provision	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Tax Provision	NOTE 5 – Income Tax Provision Tax Cuts and Jobs Act The Tax Cuts and Jobs Act (the “Tax Act”) was enacted on December 22, 2017. The Tax Act reduced the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018, required companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, provided an exemption from U.S. federal tax for dividends received from foreign subsidiaries, and created new taxes on certain foreign sourced earnings. As of the completion of these financial statements and related disclosures, we have not completed our accounting for the tax effects of the Tax Act on our 2017 tax year. We have not made any adjustments to the provisional tax expense of $45.9 million we recorded in the fourth quarter of 2017 to account for the tax effects of the Tax Act. The Company expects to finalize the accounting for the effects of the Tax Act on the 2017 tax year no later than the fourth quarter of 2018, in accordance with Securities and Exchange Commission Staff Accounting Bulletin No. 118. Future adjustments made to the provisional effects will be reported as a component of income tax expense from continuing operations in the reporting period in which any such adjustments are determined. We incorporated the effects of the Tax Act into our 30.4% estimated annual effective tax rate for 2018. As shown below, the actual 29.7% effective tax rate for the quarter ended September 30, 2018, varies from the estimated annual tax rate due to discrete items related to stock-based compensation activity during the quarter (accounted for under ASU 2016-09). The table below sets forth information related to our income tax expense: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Domestic pre-tax loss $ (7,267 ) $ (27,783 ) $ (11,289 ) $ (63,026 ) Foreign pre-tax income $ 51,667 $ 47,613 $ 118,412 $ 104,821 Income tax provision $ 13,190 $ 5,052 $ 31,726 $ 11,651 Effective tax rate 29.7 % 25.5 % 29.6 % 27.9 % Impact of tax holidays on tax expense $ 638 $ (733 ) $ (104 ) $ (2,553 ) Earnings per share impact of tax holidays: Basic $ (0.01 ) $ 0.01 $ - $ 0.05 Diluted $ (0.01 ) $ 0.01 $ - $ 0.05 The increase in the effective tax rate for the three and nine months ended September 30, 2018 when compared to the three and nine months ended September 30, 2017, is primarily attributable to the “GILTI” tax, which is a new tax on global intangible low-taxed income of non-U.S. subsidiaries that was created by the Tax Act and to which the Company is subject effective January 1, 2018. Our undistributed foreign earnings continue to be indefinitely reinvested in foreign operations, with limited exceptions related to earnings of European 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. 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, 2018
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, 2018 2017 2018 2017 Cost of goods sold $ 96 $ 152 $ 267 $ 462 Selling, general and administrative 3,993 4,050 13,477 11,348 Research and development 807 760 2,233 2,117 Total share-based compensation expense $ 4,896 $ 4,962 $ 15,977 $ 13,927 The table below sets forth share-based compensation expense by type: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Stock options $ - $ 168 $ 275 $ 767 Share grants 4,896 4,794 15,702 13,160 Total share-based compensation expense $ 4,896 $ 4,962 $ 15,977 $ 13,927 Stock Options. Approximately $4.9 million in cash proceeds was received from stock option exercises during the nine months ended September 30, 2018. As of September 30, 2018, there was 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 that vest upon achievement of certain performance criteria. Our Chief Executive Officer had a grant of 600,000 performance-based stock units that vested upon the Company reaching $1.0 billion in revenue. Based on the Company reaching approximately $1.1 billion in revenue in 2017, our Chief Executive Officer’s grant of 600,000 performance-based stock units were released to the Chief Executive Officer, upon filing of the Company’s Annual Report on Form 10-K, in February 2018. The expense related to the 600,000 performance-based units was all recognized in previous periods. During the nine months ended September 30, 2018, we issued 639,755 stock awards. This was primarily made up of the annual grant for officers, employees and directors. As of September 30, 2018, total unrecognized share-based compensation expense related to share grants was approximately $39.9 million, before income taxes, and is expected to be recognized over a weighted average period of approximately 2.4 years. Stock Modification. During the nine months ended September 30, 2018 we modified previously granted stock option and stock awards for two corporate officers who retired. The result of the modification was the acceleration of the vesting of 7,500 stock options and 79,720 stock awards for the corporate officers. The incremental expense recorded for this modification was approximately $1.8 million, which was expensed in SG&A in the nine months ended September 30, 2018.

Segment Information and Revenue

Segment Information and Revenue	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Information and Revenue	NOTE 7 – Segment Information and Revenue 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 and nine months ended September 30, 2018, one customer, a broad-based global distributor that sells to thousands of different end users, accounted for 10.2% and 10.5% or $32.7 million and $94.4 million, respectively, of our revenue. The same customer accounted for 10.3%, or $29.3 million, of our revenue for the three months ended September 30, 2017. No customer accounted for 10% or greater of our outstanding accounts receivable at September 30, 2018 or 2017. No customer accounted for 10% or greater of our revenue for the nine months ended September 30, 2017. The tables below set forth net sales based on the location of the subsidiary producing the net sale. 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 Three Months Ended September 30, 2017 Asia North America Europe Consolidated Total sales $ 263,088 $ 31,320 $ 47,307 $ 341,715 Intercompany elimination (37,475 ) (4,061 ) (14,932 ) (56,468 ) Net sales $ 225,613 $ 27,259 $ 32,375 $ 285,247 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 As of and for the Nine Months Ended September 30, 2017 Asia North America Europe Consolidated Total sales $ 731,982 $ 122,072 $ 134,132 $ 988,186 Intercompany elimination (111,963 ) (44,547 ) (45,902 ) (202,412 ) Net sales $ 620,019 $ 77,525 $ 88,230 $ 785,774 Property, plant and equipment, net $ 372,153 $ 52,737 $ 21,162 $ 446,052 Total assets $ 1,017,801 $ 301,763 $ 221,025 $ 1,540,589 Changes in Accounting Policies. Effective January 1, 2018, we adopted a comprehensive new revenue recognition standard. The details of the significant changes to our accounting policies resulting from the adoption of the new standard are set out below. We adopted the standard using a modified retrospective method. There was no change in our revenue reported for the three and nine months ended September 30, 2017. The adoption of this standard did not have a material impact on our condensed consolidated financial position, reported revenue, results of operations or cash flows as of and for the three or nine months ended September 30, 2018. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. Generally speaking, our performance obligations represent a promise to transfer various semiconductor products, and have the same pattern of revenue recognition. Our performance obligations are satisfied at either a point in time, or over time as work progresses. The vast majority of our revenue from products and services is accounted for at a point in time. Substantially all of our revenue in direct and Distributor sales is recognized at a point in time. Further, the payment terms on our sales are based on negotiations with our customers. Customers can order different types of semiconductors in a single contract (purchase order), and each line on a purchase order represents a separate performance obligation. Depending on the terms of an arrangement, we may also be responsible for shipping and handling activities. In accordance with ASC 606-10-25-18B, we have elected to account for shipping and handling as activities to fulfill our promise to transfer the good(s). As such, shipping and handling activities do not represent a separate performance obligation, and are accrued as a fulfillment cost. Further, although we offer warranties on our products, our warranties are considered to be assurance-type in nature and do not cover anything beyond ensuring that the product is functioning as intended. Based on the guidance in ASC 606, assurance-type warranties do not represent separate performance obligations; therefore, the primary performance obligation in the majority of our contracts is the delivery of a specific good through the purchase order submitted by our customer. We record allowances/reserves for a number of items. The following items are the largest dollar items for which we record allowances/reserves with ship and debit making up the vast majority: (i) ship and debit, which arise when we issue credit to certain distributors upon their shipments to their end customers; (ii) stock rotation, which are contractual obligations that permit certain distributors, up to four times a year, to return a portion of their inventory based on historical shipments to them in exchange for an equal and offsetting order; and (iii) price protection, which arise when market conditions cause average selling prices to decrease and we issue credit to certain distributors on their inventory. Ship and debit reserves are recorded as a reduction to net sales with a corresponding reduction to accounts receivable. Stock rotation reserves and price protection reserves are recorded as a reduction to net sales with a corresponding increase in accrued liabilities. We also assess our customer’s ability and intention to pay, which is based on a variety of factors including our customer’s historical payment experience, their financial condition and the condition of the global economy and financial markets. Payment terms and conditions typically vary depending on negotiations with the customer. Disaggregation of Revenue. We disaggregate revenue 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 and the location of the customer based on the location to where the products were shipped for the three and nine months ended September 30, 2018 and 2017: Net Sales for the Three Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China $60,037 $54,052 $113,191 $103,183 U.S. 4,409 4,688 30,550 20,698 Korea 4,597 5,134 13,250 12,287 Germany 3,076 3,078 20,912 18,678 Singapore 637 461 16,979 17,440 Taiwan 621 578 17,675 14,749 All others (1) 20,574 17,413 14,438 12,808 Total $93,951 $85,404 $226,995 $199,843 Percent of Net Sales by Type for the Three Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China 64% 63% 50% 52% U.S. 5% 5% 13% 10% Korea 5% 6% 6% 6% Germany 3% 4% 9% 9% Singapore 1% 1% 7% 9% Taiwan 1% 1% 8% 7% All others (1) 21% 20% 7% 7% Total 100% 100% 100% 100% Total Net Sales for the Three Months Ended September 30, Dollar Percent of Net Sales 2018 2017 2018 2017 China $173,228 $157,235 54% 55% U.S. 34,959 25,386 11% 9% Korea 17,847 17,421 6% 6% Germany 23,988 21,756 7% 8% Singapore 17,616 17,901 5% 6% Taiwan 18,296 15,327 6% 5% All others (1) 35,012 30,221 11% 11% Total $320,946 $285,247 100% 100% Net Sales for the Nine Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China $164,109 $162,241 $323,875 $270,904 U.S. 12,866 13,149 78,081 57,212 Korea 12,148 14,092 32,163 36,693 Germany 9,001 8,248 63,343 49,962 Singapore 1,549 635 52,380 43,205 Taiwan 2,399 5,132 52,696 44,453 All others (1) 52,558 47,940 42,375 31,908 Total $254,630 $251,437 $644,913 $534,337 Percent of Net Sales by Type for the Nine Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China 64% 65% 50% 51% U.S. 5% 5% 12% 11% Korea 5% 6% 5% 7% Germany 4% 3% 10% 9% Singapore 1% - 8% 8% Taiwan 1% 2% 8% 8% All others (1) 20% 19% 7% 6% Total 100% 100% 100% 100% Total Net Sales for the Nine Months Ended September 30, Dollar Percent of Net Sales 2018 2017 2018 2017 China $487,984 $433,145 54% 55% U.S. 90,947 70,361 10% 9% Korea 44,311 50,785 5% 6% Germany 72,344 58,210 8% 7% Singapore 53,929 43,840 6% 6% Taiwan 55,095 49,585 6% 6% All others (1) 94,933 79,848 11% 11% Total $899,543 $785,774 100% 100% (1) Represents countries with less than 3% of the total net sales each. Contract Balances. The timing of revenue recognition, billings, and cash collections can result in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the condensed consolidated balance sheets. However, billing generally occurs at or near the same time as revenue recognition, resulting in limited activity related to contract assets and liabilities. Contract asset and liability balances for the periods ended September 30, 2018, and December 31, 2017 were immaterial to our condensed consolidated financial statements. Other Practical Expedients Elected. The Company decided to make use of the following practical expedients available under ASC 606: • Sales tax excluded from the transaction price - The FASB decided to provide in ASU 2016-12 a practical expedient that permits entities to exclude from the transaction price all sales taxes that are assessed by a governmental authority and that are imposed on and concurrent with a specific revenue-producing transaction and collected by the entity from a customer (for example, sales, use, value added, and some excise taxes); • Incremental contract costs - Expense the incremental costs of obtaining a contract, when incurred and the amortization period of the asset • Portfolio approach - This guidance specifies the accounting for an individual contract with a customer. However, as a practical expedient, an entity may apply this guidance to a portfolio of contracts (or performance obligations) with similar characteristics if the entity reasonably expects that the effects on the financial statements of applying this guidance to the portfolio would not differ materially from applying this guidance to the individual contracts (or performance obligations) within that portfolio.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 8 – Commitments and Contingencies Purchase commitments – As of September 30, 2018, we had approximately $11.9 million in non-cancelable purchase contracts related to capital expenditures, primarily related to our manufacturing facilities in Asia. As of September 30, 2018 we also had a commitment to purchase approximately $130.0 million of wafers to be used in our manufacturing process. These wafer purchases will occur between 2018 and 2020. Defined Benefit Plan - We have a contributory defined benefit plan that covers certain employees in the United Kingdom. As of September 30, 2018, the unfunded liability for this defined benefit plan was approximately $25.1 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). The trustees are required to review the funding position every three years, and the most recent review was carried out as of April 5, 2016. The outcome of a review can result in a change in the amount of the payment. Contingencies – From time to time, we are involved in various legal proceedings that arise in the normal course of business. While we intend to defend any lawsuit vigorously, we presently believe that the ultimate outcome of any current pending legal proceeding will not have any material adverse effect on our financial position, cash flows or operating results. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. An unfavorable ruling could include monetary damages, which could impact on our business and operating results for the period in which the ruling occurs or future periods. Based on information available, we evaluate the likelihood of potential outcomes of all pending disputes. We record an appropriate liability when the amount of any liability associated with a pending dispute is deemed probable and reasonably estimable. In addition, we do not accrue for estimated legal fees and other directly related costs as they are expensed as incurred. The Company is not currently a party to any pending litigation that the Company considers material.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 9 – Derivative Financial Instruments 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, 2018, 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. There is no fair value of our foreign exchange hedges and therefore they are not recorded in our condensed consolidated balance sheets. The table below sets forth outstanding foreign currency forward contracts at September 30, 2018 and December 31, 2017: Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 2,200 September 2018 November 2018 EUR/GPB 0.89136 Non-designated 11,482 September 2018 November 2018 EUR/USD 1.1659 Non-designated 28,104 September 2018 November 2018 GBP/USD 1.3068 Non-designated 39,811 September 2018 November 2018 USD/CNY 6.8889 Non-designated 907 September 2018 November 2018 USD/JPY 113.16 Non-designated 47,435 September 2018 November 2018 USD/TWD 30.392 Non-designated Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 2,494 December 2017 January 2018 EUR/GBP 1.2009 Non-designated 10,514 December 2017 January 2018 EUR/USD 1.2009 Non-designated 10,612 December 2017 January 2018 GBP/USD 1.3541 Non-designated 31,834 December 2017 January 2018 USD/CNY 6.5343 Non-designated 1,594 December 2017 January 2018 USD/JPY 112.35 Non-designated 30,594 December 2017 January 2018 USD/TWD 29.406 Non-designated * EUR = Euro GBP = British Pound Sterling USD = United States Dollar CNY = Chinese Yuan Renminbi JPY = Japan Yen TWD = Taiwan dollar Hedges of Interest Rate Risk - The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps, including interest rate collars, as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The table below sets forth information related to the number of and the notional amount of our interest rate related derivative instruments: Number of Instruments Notional Amount September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Interest rate swaps and collars 12 14 $ 210,000 $ 220,000 The table below sets forth the fair value of the Company’s interest rate related derivative financial instruments as well as their classification on our condensed consolidated balance sheets: Fair Value Other Current Assets Other Assets September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Interest rate swaps and collars $ 2,096 $ 486 $ 5,477 $ 3,398 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, 2018 and 2017: Amount of Gain or (Loss) Recognized in OCI on Derivative Location of Gain or (Loss) Reclassified from Amount of Gain or (Loss) Reclassified from Accumulated OCI into Net Income Derivatives Designated as Hedging Instruments September 30, 2018 September 30, 2017 Accumulated OCI into Income September 30, 2018 September 30, 2017 Three Months Ended Interest rate swaps and collars $ 636 $ 472 Interest expense $ 299 $ 86 Nine Months Ended Interest rate swaps and collars $ 4,143 $ (72 ) Interest expense $ 526 $ 509 We estimate that $2.1 million of net derivative gains included in accumulated other comprehensive income (“AOCI”) as of September 30, 2018 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 or nine months ended September 30, 2018 or 2017. ` Amount of Gain or (Loss) Recognized in Net Income Location of Gain or (Loss) Recognized in Net Instruments September 30, 2018 September 30, 2017 Income Three Months Ended Foreign currency forward contracts $ (2,200 ) $ 542 Foreign currency (loss) gain, net Nine Months Ended Foreign currency forward contracts $ (7,570 ) $ 472 Foreign currency (loss) gain, net At September 30, 2018 and December 31, 2017, the fair value of derivatives in a net asset position, which includes accrued interest but excludes any adjustments for nonperformance risk, related to these agreements was $7.6 million and $3.8 million, respectively. As of September 30, 2018 and December 31, 2017, the Company had not posted any collateral related to these agreements.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	NOTE 10 – 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, 2018 and December 31, 2017, these investments totaled approximately $10.5 million and $8.8 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, 2018
Related Party Transactions [Abstract]
Related Parties	NOTE 11 – 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 15.5% of o ur ou t s t a nd i n g C o m m on S toc k as of September 30, 2 018 , 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 . 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 services and consulting to Keylink. The aggregate amounts paid to Keylink for the three months ended September 30, 2018 and 2017 were approximately $3.8 million and $4.5 million, respectively. The aggregate amounts for these services and consulting for the nine months ended September 30, 2018 and 2017 were approximately $12.6 million and $12.4 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., 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, 2018 2017 2018 2017 LSC Net sales $ 304 $ 329 $ 896 $ 1,064 Purchases $ 5,208 $ 6,097 $ 16,630 $ 19,258 Nuvoton Purchases $ 2,361 $ 3,202 $ 7,774 $ 9,487 Keylink Net sales $ 4,684 $ 2,690 $ 8,762 $ 6,925 Purchases $ 907 $ 1,069 $ 2,646 $ 3,090 JCP Purchases $ 201 $ 322 $ 488 $ 844 The table below sets forth accounts receivable from, and accounts payable to, related parties: September 30, December 31, 2018 2017 LSC Accounts receivable $ 304 $ 342 Accounts payable $ 3,025 $ 3,308 Keylink Accounts receivable $ 6,186 $ 4,089 Accounts payable $ 4,384 $ 5,016 Nuvoton Accounts payable $ 1,203 $ 1,121 JCP Accounts payable $ 174 $ 317

Restructuring Costs

Restructuring Costs	9 Months Ended
	Sep. 30, 2018
Restructuring And Related Activities [Abstract]
Restructuring Costs	NOTE 12 – Restructuring Costs In February 2017, the Company announced its plan to transfer its wafer fabrication operation located in Lee’s Summit, MO. (“ KFAB”) The table below sets forth the restructuring costs, recorded in restructuring expense in the condensed consolidated statements of operations, incurred during the three and nine months ended September 30, 2018 and 2017: Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Early supply contract termination $ - $ - $ - $ 1,985 Cost of equipment relocation - 429 220 501 Asset retirement obligation - 701 - 935 Retention costs - 909 (14 ) 2,687 $ - $ 2,039 $ 206 $ 6,108 In connection with the KFAB closure, during the nine months ended September 30, 2017, the Company also recorded separation costs of $0.5 million in cost of goods sold, $0.09 million in selling, general and administrative expense and $0.02 million in research and development expense. The table below sets forth the costs accrued and paid related to the KFAB restructuring: Retention Costs Equipment Relocation Total Beginning balance, January 1, 2018 $ 659 $ 645 $ 1,304 Costs accrued (14 ) 526 512 Restructuring costs paid (645 ) (1,171 ) (1,816 ) Balance at September 30, 2018 $ - $ - $ - This asset retirement obligation is for the estimated amounts to be paid to contractors to remediate the KFAB facility upon vacating the property. The table below sets forth the asset retirement obligation related to the KFAB restructuring: Asset retirement obligation, January 1, 2018 $ 389 Reversal of accrual (389 ) Asset retirement obligation, September 30, 2018 $ - In connection with the asset retirement obligation as of September 30, 2018, the offsetting asset has been fully amortized.

ERIS Acquisition

ERIS Acquisition	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
ERIS Acquisition	NOTE 13 – ERIS Acquisition In July 2018, our 60% owned subsidiary, ERIS Technology Corporation (“Eris”), acquired from Yea Shin Technology Corporation ("Yea Shin") and its shareholders 60% of Yea Shin’s outstanding shares for approximately $6.4 million in cash. Yea Shin operates a wafer fabrication facility located in Tao Yuan county, Taiwan that was established in 1993. The purpose of the acquisition is to expand the current wafer production capacity of Eris. Eris also entered into a property purchase agreement with Yong Xiang Development Corporation ("Yong Xiang") to purchase the plant and facility leased by it to Yea Shin. The total purchase price of the property is approximately $25.5 million. Eris expects to complete the purchase of the facility no later than December 31, 2020. Eris has leased from Yong Xiang the plant and facility until the purchase has been completed. The monthly lease payment is approximately 0.04 million for the first 8.5 months and approximately $0.03 million for the remaining period. Total lease commitment is approximately $1.1 million assuming the lease term is through December 31, 2020.

Nature of Operations, Basis o_2

Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2018
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. Our corporate headquarters and Americas’ sales office 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; Manchester, England; and Neuhaus, Germany. Our wafer fabrication facilities are located in Manchester and in Shanghai, China. 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; Manchester; Shanghai; Shenzhen, Yangzhou, China; Seongnam-si, South Korea; and 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, 2017 is derived from audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 filed with the Securities and Exchange Commission (“SEC”) on February 20, 2018 (“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, 2018 are not necessarily indicative of the results that may be expected for other interim periods or the year ending December 31, 2018. 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 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. 2014-09, Revenue from Contracts with Customers (Topic 606) - ASU No. 2016-18, Statement of Cash Flows – Restricted Cash (Topic 230) Standards Effective in Future Years ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”) - The ASU will become effective for the Company for interim and annual reporting periods in fiscal years beginning after December 15, 2018. The standard offers a number of practical expedients for transition and certain expedients specific to lessees or lessors. Both lessees and lessors are permitted to make an election to apply a package of practical expedients available for implementation under the standard. For transition, the Company will recognize all effects of transition in the beginning of the adoption reporting period on January 1, 2019. We do not expect to elect the use-of-hindsight or land easement practical expedients, the latter not being applicable to us. The Company will continue its implementation work of ASU 2016-02 in 2018, including enhancements to the Company’s internal control framework, accounting systems and related documentation surrounding its lease accounting processes and the preparation of any additional disclosures that will be required. ASU 2018-10, Codification Improvements to Topic 842, Leases (“ASU 2016-02”) - ASU 2018-11, Leases (Topic 842): Targeted Improvements (“ASU 2018-11”) - The Company will adopt this standard on January 1, 2019. ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting ("ASU 2018-07") - ASU 2018-13, Changes to Disclosure Requirements for Fair Value Measurements (“ASU 2018-13”) - ASU 2018-14, Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans ("ASU No. 2018-14").
Revenue	Changes in Accounting Policies. Effective January 1, 2018, we adopted a comprehensive new revenue recognition standard. The details of the significant changes to our accounting policies resulting from the adoption of the new standard are set out below. We adopted the standard using a modified retrospective method. There was no change in our revenue reported for the three and nine months ended September 30, 2017. The adoption of this standard did not have a material impact on our condensed consolidated financial position, reported revenue, results of operations or cash flows as of and for the three or nine months ended September 30, 2018. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. Generally speaking, our performance obligations represent a promise to transfer various semiconductor products, and have the same pattern of revenue recognition. Our performance obligations are satisfied at either a point in time, or over time as work progresses. The vast majority of our revenue from products and services is accounted for at a point in time. Substantially all of our revenue in direct and Distributor sales is recognized at a point in time. Further, the payment terms on our sales are based on negotiations with our customers. Customers can order different types of semiconductors in a single contract (purchase order), and each line on a purchase order represents a separate performance obligation. Depending on the terms of an arrangement, we may also be responsible for shipping and handling activities. In accordance with ASC 606-10-25-18B, we have elected to account for shipping and handling as activities to fulfill our promise to transfer the good(s). As such, shipping and handling activities do not represent a separate performance obligation, and are accrued as a fulfillment cost. Further, although we offer warranties on our products, our warranties are considered to be assurance-type in nature and do not cover anything beyond ensuring that the product is functioning as intended. Based on the guidance in ASC 606, assurance-type warranties do not represent separate performance obligations; therefore, the primary performance obligation in the majority of our contracts is the delivery of a specific good through the purchase order submitted by our customer. We record allowances/reserves for a number of items. The following items are the largest dollar items for which we record allowances/reserves with ship and debit making up the vast majority: (i) ship and debit, which arise when we issue credit to certain distributors upon their shipments to their end customers; (ii) stock rotation, which are contractual obligations that permit certain distributors, up to four times a year, to return a portion of their inventory based on historical shipments to them in exchange for an equal and offsetting order; and (iii) price protection, which arise when market conditions cause average selling prices to decrease and we issue credit to certain distributors on their inventory. Ship and debit reserves are recorded as a reduction to net sales with a corresponding reduction to accounts receivable. Stock rotation reserves and price protection reserves are recorded as a reduction to net sales with a corresponding increase in accrued liabilities. We also assess our customer’s ability and intention to pay, which is based on a variety of factors including our customer’s historical payment experience, their financial condition and the condition of the global economy and financial markets. Payment terms and conditions typically vary depending on negotiations with the customer. Disaggregation of Revenue. We disaggregate revenue 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. Contract Balances. The timing of revenue recognition, billings, and cash collections can result in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the condensed consolidated balance sheets. However, billing generally occurs at or near the same time as revenue recognition, resulting in limited activity related to contract assets and liabilities. Contract asset and liability balances for the periods ended September 30, 2018, and December 31, 2017 were immaterial to our condensed consolidated financial statements. Other Practical Expedients Elected. The Company decided to make use of the following practical expedients available under ASC 606: • Sales tax excluded from the transaction price - The FASB decided to provide in ASU 2016-12 a practical expedient that permits entities to exclude from the transaction price all sales taxes that are assessed by a governmental authority and that are imposed on and concurrent with a specific revenue-producing transaction and collected by the entity from a customer (for example, sales, use, value added, and some excise taxes); • Incremental contract costs - Expense the incremental costs of obtaining a contract, when incurred and the amortization period of the asset • Portfolio approach - This guidance specifies the accounting for an individual contract with a customer. However, as a practical expedient, an entity may apply this guidance to a portfolio of contracts (or performance obligations) with similar characteristics if the entity reasonably expects that the effects on the financial statements of applying this guidance to the portfolio would not differ materially from applying this guidance to the individual contracts (or performance obligations) within that portfolio.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
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, 2018 2017 2018 2017 Earnings (numerator) Net income attributable to common stockholders $ 30,908 $ 14,450 $ 74,502 $ 28,846 Shares (denominator) Weighted average common shares outstanding (basic) 50,115 49,057 49,713 48,633 Dilutive effect of stock options and stock awards outstanding 962 1,359 1,170 1,428 Adjusted weighted average common shares outstanding (diluted) 51,077 50,416 50,883 50,061 Earnings per share attributable to common stockholders Basic $ 0.62 $ 0.29 $ 1.50 $ 0.59 Diluted $ 0.61 $ 0.29 $ 1.46 $ 0.58 Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive - 651 94 704

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2018
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, 2018 December 31, 2017 Finished goods $ 62,004 $ 81,194 Work-in-progress 57,504 52,578 Raw materials 99,638 82,734 Total $ 219,146 $ 216,506

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Changes in Goodwill	The table below sets forth the changes in goodwill : Balance at December 31, 2017 $ 134,187 ERIS acquisition of Yea Shin Technology Corporation 559 Foreign currency translation adjustment (1,836 ) Balance at September 30, 2018 $ 132,910
Schedule of Intangible Assets Other Than Goodwill	The table below sets forth the value of intangible assets, other than goodwill: September 30, December 31, 2018 2017 Intangible assets subject to amortization: Gross carrying amount $ 238,867 $ 234,533 Accumulated amortization (101,923 ) (88,059 ) Foreign currency translation adjustment (8,265 ) (8,249 ) Total 128,679 138,225 Intangible assets with indefinite lives: Gross carrying amount 14,883 19,217 Foreign currency translation adjustment (1,075 ) (997 ) Total 13,808 18,220 Total intangible assets, net $ 142,487 $ 156,445
Schedule of Amortization Expense Related to Intangible Assets	The table below sets forth amortization expense related to intangible assets subject to amortization: Amortization expense 2018 2017 Three months ended September 30 $ 4,418 $ 4,694 Nine months ended September 30 $ 13,863 $ 14,098

Income Tax Provision (Tables)

Income Tax Provision (Tables)	9 Months Ended
	Sep. 30, 2018
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, 2018 2017 2018 2017 Domestic pre-tax loss $ (7,267 ) $ (27,783 ) $ (11,289 ) $ (63,026 ) Foreign pre-tax income $ 51,667 $ 47,613 $ 118,412 $ 104,821 Income tax provision $ 13,190 $ 5,052 $ 31,726 $ 11,651 Effective tax rate 29.7 % 25.5 % 29.6 % 27.9 % Impact of tax holidays on tax expense $ 638 $ (733 ) $ (104 ) $ (2,553 ) Earnings per share impact of tax holidays: Basic $ (0.01 ) $ 0.01 $ - $ 0.05 Diluted $ (0.01 ) $ 0.01 $ - $ 0.05

Share-Based Compensation (Table

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2018
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, 2018 2017 2018 2017 Cost of goods sold $ 96 $ 152 $ 267 $ 462 Selling, general and administrative 3,993 4,050 13,477 11,348 Research and development 807 760 2,233 2,117 Total share-based compensation expense $ 4,896 $ 4,962 $ 15,977 $ 13,927
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, 2018 2017 2018 2017 Stock options $ - $ 168 $ 275 $ 767 Share grants 4,896 4,794 15,702 13,160 Total share-based compensation expense $ 4,896 $ 4,962 $ 15,977 $ 13,927

Segment Information and Reven_2

Segment Information and Revenue (Tables)	9 Months Ended
	Sep. 30, 2018
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, 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 Three Months Ended September 30, 2017 Asia North America Europe Consolidated Total sales $ 263,088 $ 31,320 $ 47,307 $ 341,715 Intercompany elimination (37,475 ) (4,061 ) (14,932 ) (56,468 ) Net sales $ 225,613 $ 27,259 $ 32,375 $ 285,247 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 As of and for the Nine Months Ended September 30, 2017 Asia North America Europe Consolidated Total sales $ 731,982 $ 122,072 $ 134,132 $ 988,186 Intercompany elimination (111,963 ) (44,547 ) (45,902 ) (202,412 ) Net sales $ 620,019 $ 77,525 $ 88,230 $ 785,774 Property, plant and equipment, net $ 372,153 $ 52,737 $ 21,162 $ 446,052 Total assets $ 1,017,801 $ 301,763 $ 221,025 $ 1,540,589
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 and the location of the customer based on the location to where the products were shipped for the three and nine months ended September 30, 2018 and 2017: Net Sales for the Three Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China $60,037 $54,052 $113,191 $103,183 U.S. 4,409 4,688 30,550 20,698 Korea 4,597 5,134 13,250 12,287 Germany 3,076 3,078 20,912 18,678 Singapore 637 461 16,979 17,440 Taiwan 621 578 17,675 14,749 All others (1) 20,574 17,413 14,438 12,808 Total $93,951 $85,404 $226,995 $199,843 Percent of Net Sales by Type for the Three Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China 64% 63% 50% 52% U.S. 5% 5% 13% 10% Korea 5% 6% 6% 6% Germany 3% 4% 9% 9% Singapore 1% 1% 7% 9% Taiwan 1% 1% 8% 7% All others (1) 21% 20% 7% 7% Total 100% 100% 100% 100% Total Net Sales for the Three Months Ended September 30, Dollar Percent of Net Sales 2018 2017 2018 2017 China $173,228 $157,235 54% 55% U.S. 34,959 25,386 11% 9% Korea 17,847 17,421 6% 6% Germany 23,988 21,756 7% 8% Singapore 17,616 17,901 5% 6% Taiwan 18,296 15,327 6% 5% All others (1) 35,012 30,221 11% 11% Total $320,946 $285,247 100% 100% Net Sales for the Nine Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China $164,109 $162,241 $323,875 $270,904 U.S. 12,866 13,149 78,081 57,212 Korea 12,148 14,092 32,163 36,693 Germany 9,001 8,248 63,343 49,962 Singapore 1,549 635 52,380 43,205 Taiwan 2,399 5,132 52,696 44,453 All others (1) 52,558 47,940 42,375 31,908 Total $254,630 $251,437 $644,913 $534,337 Percent of Net Sales by Type for the Nine Months Ended September 30, Direct Sales Distributor 2018 2017 2018 2017 China 64% 65% 50% 51% U.S. 5% 5% 12% 11% Korea 5% 6% 5% 7% Germany 4% 3% 10% 9% Singapore 1% - 8% 8% Taiwan 1% 2% 8% 8% All others (1) 20% 19% 7% 6% Total 100% 100% 100% 100% Total Net Sales for the Nine Months Ended September 30, Dollar Percent of Net Sales 2018 2017 2018 2017 China $487,984 $433,145 54% 55% U.S. 90,947 70,361 10% 9% Korea 44,311 50,785 5% 6% Germany 72,344 58,210 8% 7% Singapore 53,929 43,840 6% 6% Taiwan 55,095 49,585 6% 6% All others (1) 94,933 79,848 11% 11% Total $899,543 $785,774 100% 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, 2018
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, 2018 and December 31, 2017: Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 2,200 September 2018 November 2018 EUR/GPB 0.89136 Non-designated 11,482 September 2018 November 2018 EUR/USD 1.1659 Non-designated 28,104 September 2018 November 2018 GBP/USD 1.3068 Non-designated 39,811 September 2018 November 2018 USD/CNY 6.8889 Non-designated 907 September 2018 November 2018 USD/JPY 113.16 Non-designated 47,435 September 2018 November 2018 USD/TWD 30.392 Non-designated Notional Amount Effective Date Maturity Date Index* Weighted Average Foreign Exchange Rate Balance Sheet Hedge Designation $ 2,494 December 2017 January 2018 EUR/GBP 1.2009 Non-designated 10,514 December 2017 January 2018 EUR/USD 1.2009 Non-designated 10,612 December 2017 January 2018 GBP/USD 1.3541 Non-designated 31,834 December 2017 January 2018 USD/CNY 6.5343 Non-designated 1,594 December 2017 January 2018 USD/JPY 112.35 Non-designated 30,594 December 2017 January 2018 USD/TWD 29.406 Non-designated * 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	The table below sets forth information related to the number of and the notional amount of our interest rate related derivative instruments: Number of Instruments Notional Amount September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Interest rate swaps and collars 12 14 $ 210,000 $ 220,000
Summary of Fair Value of Interest Rate Related Derivative Financial Instruments and Their Classification on Condensed Consolidated Balance Sheets	The table below sets forth the fair value of the Company’s interest rate related derivative financial instruments as well as their classification on our condensed consolidated balance sheets: Fair Value Other Current Assets Other Assets September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Interest rate swaps and collars $ 2,096 $ 486 $ 5,477 $ 3,398
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, 2018 and 2017: Amount of Gain or (Loss) Recognized in OCI on Derivative Location of Gain or (Loss) Reclassified from Amount of Gain or (Loss) Reclassified from Accumulated OCI into Net Income Derivatives Designated as Hedging Instruments September 30, 2018 September 30, 2017 Accumulated OCI into Income September 30, 2018 September 30, 2017 Three Months Ended Interest rate swaps and collars $ 636 $ 472 Interest expense $ 299 $ 86 Nine Months Ended Interest rate swaps and collars $ 4,143 $ (72 ) Interest expense $ 526 $ 509 ` Amount of Gain or (Loss) Recognized in Net Income Location of Gain or (Loss) Recognized in Net Instruments September 30, 2018 September 30, 2017 Income Three Months Ended Foreign currency forward contracts $ (2,200 ) $ 542 Foreign currency (loss) gain, net Nine Months Ended Foreign currency forward contracts $ (7,570 ) $ 472 Foreign currency (loss) gain, net

Related Parties (Tables)

Related Parties (Tables)	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Schedule of 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, 2018 2017 2018 2017 LSC Net sales $ 304 $ 329 $ 896 $ 1,064 Purchases $ 5,208 $ 6,097 $ 16,630 $ 19,258 Nuvoton Purchases $ 2,361 $ 3,202 $ 7,774 $ 9,487 Keylink Net sales $ 4,684 $ 2,690 $ 8,762 $ 6,925 Purchases $ 907 $ 1,069 $ 2,646 $ 3,090 JCP Purchases $ 201 $ 322 $ 488 $ 844
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, 2018 2017 LSC Accounts receivable $ 304 $ 342 Accounts payable $ 3,025 $ 3,308 Keylink Accounts receivable $ 6,186 $ 4,089 Accounts payable $ 4,384 $ 5,016 Nuvoton Accounts payable $ 1,203 $ 1,121 JCP Accounts payable $ 174 $ 317

Restructuring Costs (Tables)

Restructuring Costs (Tables)	9 Months Ended
	Sep. 30, 2018
Restructuring And Related Activities [Abstract]
Schedule of Restructuring Costs, Recorded in Restructuring Expense in Condensed Consolidated Statements of Operations, Incurred	The table below sets forth the restructuring costs, recorded in restructuring expense in the condensed consolidated statements of operations, incurred during the three and nine months ended September 30, 2018 and 2017: Three Months Ended Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 30, 2017 Early supply contract termination $ - $ - $ - $ 1,985 Cost of equipment relocation - 429 220 501 Asset retirement obligation - 701 - 935 Retention costs - 909 (14 ) 2,687 $ - $ 2,039 $ 206 $ 6,108
Schedule of Costs Accrued and Paid Related to Restructuring	The table below sets forth the costs accrued and paid related to the KFAB restructuring: Retention Costs Equipment Relocation Total Beginning balance, January 1, 2018 $ 659 $ 645 $ 1,304 Costs accrued (14 ) 526 512 Restructuring costs paid (645 ) (1,171 ) (1,816 ) Balance at September 30, 2018 $ - $ - $ -
Schedule of Asset Retirement Obligation Related to Restructuring	The table below sets forth the asset retirement obligation related to the KFAB restructuring: Asset retirement obligation, January 1, 2018 $ 389 Reversal of accrual (389 ) Asset retirement obligation, September 30, 2018 $ -

Nature of Operations, Basis o_3

Nature of Operations, Basis of Presentation and Recently Issued Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Restricted Cash	$ 0.8	$ 1.4

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details)	9 Months Ended
	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.

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings (numerator)
Net income attributable to common stockholders	$ 30,908	$ 14,450	$ 74,502	$ 28,846
Shares (denominator)
Weighted average common shares outstanding (basic)	50,115	49,057	49,713	48,633
Dilutive effect of stock options and stock awards outstanding	962	1,359	1,170	1,428
Adjusted weighted average common shares outstanding (diluted)	51,077	50,416	50,883	50,061
Earnings per share attributable to common stockholders
Basic	$ 0.62	$ 0.29	$ 1.50	$ 0.59
Diluted	$ 0.61	$ 0.29	$ 1.46	$ 0.58
Stock options and stock awards excluded from EPS calculation because the effect would be anti-dilutive		651	94	704

Inventories - Schedule of Inven

Inventories - Schedule of Inventory Current (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Finished goods	$ 62,004	$ 81,194
Work-in-progress	57,504	52,578
Raw materials	99,638	82,734
Total	$ 219,146	$ 216,506

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Goodwill
Goodwill beginning balance	$ 134,187
ERIS acquisition of Yea Shin Technology Corporation	559
Foreign currency translation adjustment	(1,836)
Goodwill ending balance	$ 132,910

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Intangible assets subject to amortization
Gross carrying amount	$ 238,867	$ 234,533
Accumulated amortization	(101,923)	(88,059)
Foreign currency translation adjustment	(8,265)	(8,249)
Total	128,679	138,225
Intangible assets with indefinite lives
Gross carrying amount	14,883	19,217
Foreign currency translation adjustment	(1,075)	(997)
Total	13,808	18,220
Total intangible assets, net	$ 142,487	$ 156,445

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Amortization Expense Related to Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 4,418	$ 4,694	$ 13,863	$ 14,098

Income Tax Provision - Addition

Income Tax Provision - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal corporate tax rate			21.00%	35.00%
Net tax expense related to the Tax Act		$ 45.9
Effective tax cut rate percent	29.70%			30.40%
Unrecognized tax benefits	$ 33.1		$ 33.1
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 2008, or for the 2010 and 2011 tax years. We are no longer subject to China income tax examinations by tax authorities for tax years before 2007. 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 2012. 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

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Domestic pre-tax loss	$ (7,267)	$ (27,783)	$ (11,289)	$ (63,026)
Foreign pre-tax income	51,667	47,613	118,412	104,821
Income tax provision	$ 13,190	$ 5,052	$ 31,726	$ 11,651
Effective tax rate	29.70%	25.50%	29.60%	27.90%
Impact of tax holidays on tax expense	$ 638	$ (733)	$ (104)	$ (2,553)
Earnings per share impact of tax holidays:
Basic	$ (0.01)	$ 0.01		$ 0.05
Diluted	$ (0.01)	$ 0.01		$ 0.05

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 4,896	$ 4,962	$ 15,977	$ 13,927
Cost of Goods Sold
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	96	152	267	462
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	3,993	4,050	13,477	11,348
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 807	$ 760	$ 2,233	$ 2,117

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 4,896	$ 4,962	$ 15,977	$ 13,927
Stock Options
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense		168	275	767
Share Grants
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 4,896	$ 4,794	$ 15,702	$ 13,160

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)CorporateOfficershares	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash proceeds received from stock option exercises			$ 4,900,000
Performance-based/restricted stock grant covering shares | shares			639,755
Revenue	$ 320,946,000	$ 285,247,000	$ 899,543,000	$ 785,774,000	$ 1,100,000,000
Corporate Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees impacted by stock modification | CorporateOfficer			2
Corporate Officers | Selling, General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental expense			$ 1,800,000
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		$ 0
Stock Options | Corporate Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock modification, number of shares subject to accelerated vesting | shares			7,500
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
Performance Grants | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based/restricted stock grant covering shares | shares			600,000
Revenue target for performance-based stock units vesting			$ 1,000,000,000
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	$ 39,900,000		$ 39,900,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition			2 years 4 months 24 days
Stock Awards | Corporate Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock modification, number of shares subject to accelerated vesting | shares			79,720

Segment Information and Reven_3

Segment Information and Revenue - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)Customer	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)Customer	Sep. 30, 2017USD ($)CustomerEmployee	Dec. 31, 2017USD ($)
Entity Wide Revenue Major Customer [Line Items]
Number of customer accounted for 10.2% and 10.5% or $32.7 and $94.4 million of revenue | Customer	1		1
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Concentration risk, revenue amount | $	$ 320,946	$ 285,247	$ 899,543	$ 785,774	$ 1,100,000
Number of customer did not account for 10% or greater of outstanding accounts receivable | Customer			0	0
Number of customer did not account for 10% or greater of revenue | Employee				0
Geographic Concentration Risk
Entity Wide Revenue Major Customer [Line Items]
Percentage of net sales	10.20%	10.30%	10.50%
Concentration risk, revenue amount | $	$ 32,700	$ 29,300	$ 94,400

Segment Information and Reven_4

Segment Information and Revenue - Schedule of Net Sales from Based on Location of the Subsidiary (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 320,946	$ 285,247	$ 899,543	$ 785,774	$ 1,100,000
Property, plant and equipment, net	454,086	446,052	454,086	446,052	459,169
Total assets	1,467,784	1,540,589	1,467,784	1,540,589	$ 1,488,673
Operating Segments
Segment Reporting Information [Line Items]
Net sales	384,484	341,715	1,064,705	988,186
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(63,538)	(56,468)	(165,162)	(202,412)
Asia
Segment Reporting Information [Line Items]
Net sales	242,945	225,613	691,125	620,019
Property, plant and equipment, net	399,632	372,153	399,632	372,153
Total assets	1,075,840	1,017,801	1,075,840	1,017,801
Asia | Operating Segments
Segment Reporting Information [Line Items]
Net sales	283,635	263,088	797,455	731,982
Asia | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(40,690)	(37,475)	(106,330)	(111,963)
North America
Segment Reporting Information [Line Items]
Net sales	42,867	27,259	100,592	77,525
Property, plant and equipment, net	30,133	52,737	30,133	52,737
Total assets	202,024	301,763	202,024	301,763
North America | Operating Segments
Segment Reporting Information [Line Items]
Net sales	51,640	31,320	116,868	122,072
North America | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(8,773)	(4,061)	(16,276)	(44,547)
Europe
Segment Reporting Information [Line Items]
Net sales	35,134	32,375	107,826	88,230
Property, plant and equipment, net	24,321	21,162	24,321	21,162
Total assets	189,920	221,025	189,920	221,025
Europe | Operating Segments
Segment Reporting Information [Line Items]
Net sales	49,209	47,307	150,382	134,132
Europe | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (14,075)	$ (14,932)	$ (42,556)	$ (45,902)

Segment Information and Reven_5

Segment Information and Revenue - Schedule of Net Sales by Direct Sales or Distributor and Location (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 320,946	$ 285,247	$ 899,543	$ 785,774	$ 1,100,000
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 93,951	$ 85,404	$ 254,630	$ 251,437
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 226,995	$ 199,843	$ 644,913	$ 534,337
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
China
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 173,228	$ 157,235	$ 487,984	$ 433,145
Percentage of net sales		54.00%	55.00%	54.00%	55.00%
China | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 60,037	$ 54,052	$ 164,109	$ 162,241
Percentage of net sales		64.00%	63.00%	64.00%	65.00%
China | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 113,191	$ 103,183	$ 323,875	$ 270,904
Percentage of net sales		50.00%	52.00%	50.00%	51.00%
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 34,959	$ 25,386	$ 90,947	$ 70,361
Percentage of net sales		11.00%	9.00%	10.00%	9.00%
United States | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 4,409	$ 4,688	$ 12,866	$ 13,149
Percentage of net sales		5.00%	5.00%	5.00%	5.00%
United States | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 30,550	$ 20,698	$ 78,081	$ 57,212
Percentage of net sales		13.00%	10.00%	12.00%	11.00%
Korea
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 17,847	$ 17,421	$ 44,311	$ 50,785
Percentage of net sales		6.00%	6.00%	5.00%	6.00%
Korea | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 4,597	$ 5,134	$ 12,148	$ 14,092
Percentage of net sales		5.00%	6.00%	5.00%	6.00%
Korea | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 13,250	$ 12,287	$ 32,163	$ 36,693
Percentage of net sales		6.00%	6.00%	5.00%	7.00%
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 23,988	$ 21,756	$ 72,344	$ 58,210
Percentage of net sales		7.00%	8.00%	8.00%	7.00%
Germany | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 3,076	$ 3,078	$ 9,001	$ 8,248
Percentage of net sales		3.00%	4.00%	4.00%	3.00%
Germany | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 20,912	$ 18,678	$ 63,343	$ 49,962
Percentage of net sales		9.00%	9.00%	10.00%	9.00%
Singapore
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 17,616	$ 17,901	$ 53,929	$ 43,840
Percentage of net sales		5.00%	6.00%	6.00%	6.00%
Singapore | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 637	$ 461	$ 1,549	$ 635
Percentage of net sales		1.00%	1.00%	1.00%
Singapore | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 16,979	$ 17,440	$ 52,380	$ 43,205
Percentage of net sales		7.00%	9.00%	8.00%	8.00%
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 18,296	$ 15,327	$ 55,095	$ 49,585
Percentage of net sales		6.00%	5.00%	6.00%	6.00%
Taiwan | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 621	$ 578	$ 2,399	$ 5,132
Percentage of net sales		1.00%	1.00%	1.00%	2.00%
Taiwan | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales		$ 17,675	$ 14,749	$ 52,696	$ 44,453
Percentage of net sales		8.00%	7.00%	8.00%	8.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 35,012	$ 30,221	$ 94,933	$ 79,848
Percentage of net sales	[1]	11.00%	11.00%	11.00%	11.00%
All Others | Direct Sales
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 20,574	$ 17,413	$ 52,558	$ 47,940
Percentage of net sales	[1]	21.00%	20.00%	20.00%	19.00%
All Others | Distributor
Segment Reporting Revenue Reconciling Item [Line Items]
Net sales	[1]	$ 14,438	$ 12,808	$ 42,375	$ 31,908
Percentage of net sales	[1]	7.00%	7.00%	7.00%	6.00%
[1]	Represents countries with less than 3% of the total net sales each.

Segment Information and Reven_6

Segment Information and Revenue - Schedule of Net Sales by Direct Sales or Distributor and Location (Parenthetical) (Details)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales		100.00%	100.00%	100.00%	100.00%
All Others
Segment Reporting Revenue Reconciling Item [Line Items]
Percentage of net sales	[1]	11.00%	11.00%	11.00%	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	Sep. 30, 2018USD ($)$ / £	Sep. 30, 2018USD ($)$ / £	Sep. 30, 2018GBP (£)$ / £
Commitments And Contingencies [Line Items]
Purchase Commitments	$ 11.9	$ 11.9
Long-term purchase commitment, Amount	130
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, 2018, the unfunded liability for this defined benefit plan was approximately $25.1 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). The trustees are required to review the funding position every three years, and the most recent review was carried out as of April 5, 2016. The outcome of a review can result in a change in the amount of the payment.
Defined benefit plan, expected future benefit payments in year one	2.6	$ 2.6	£ 2
Defined benefit plan, expected future benefit payments in year two	2.6	2.6	2
Defined benefit plan, expected future benefit payments in year three	2.6	2.6	2
Defined benefit plan, expected future benefit payments in year four	2.6	2.6	2
Defined benefit plan, expected future benefit payments in year five	2.6	2.6	2
Defined benefit plan, expected future benefit payments in eight fiscal years thereafter	$ 2.6	$ 2.6	£ 2
GBP:USD exchange rate | $ / £	1.3	1.3	1.3
Unfunded liability of defined benefit plan	$ 25.1	$ 25.1

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Objectives for using derivative instruments	The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps, including interest rate collars, as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.
Net derivative gain will be reclassified from AOCI into net income	$ 2,100,000
Fair value of derivatives in net asset position	7,600,000	$ 3,800,000
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, 2018USD ($)¥ / ¥€ / $£ / $$ / ¥$ / ¥$ / $	Dec. 31, 2017USD ($)€ / $£ / $$ / ¥$ / ¥$ / $€ / £
Derivative One
Derivative [Line Items]
Notional Amount	$ 2,200,000	$ 2,494,000
Effective Date	Sep. 30, 2018	Dec. 31, 2017
Maturity Date	Nov. 30, 2018	Jan. 31, 2018
Index	EUR/GPB	EUR/GBP
Weighted Average Foreign Exchange Rate	0.89136	1.2009
Derivative Two
Derivative [Line Items]
Notional Amount	$ 11,482,000	$ 10,514,000
Effective Date	Sep. 30, 2018	Dec. 31, 2017
Maturity Date	Nov. 30, 2018	Jan. 31, 2018
Index	EUR/USD	EUR/USD
Weighted Average Foreign Exchange Rate | € / $	1.1659	1.2009
Derivative Three
Derivative [Line Items]
Notional Amount	$ 28,104,000	$ 10,612,000
Effective Date	Sep. 30, 2018	Dec. 31, 2017
Maturity Date	Nov. 30, 2018	Jan. 31, 2018
Index	GBP/USD	GBP/USD
Weighted Average Foreign Exchange Rate | £ / $	1.3068	1.3541
Derivative Four
Derivative [Line Items]
Notional Amount	$ 39,811,000	$ 31,834,000
Effective Date	Sep. 30, 2018	Dec. 31, 2017
Maturity Date	Nov. 30, 2018	Jan. 31, 2018
Index	USD/CNY	USD/CNY
Weighted Average Foreign Exchange Rate | $ / ¥	6.8889	6.5343
Derivative Five
Derivative [Line Items]
Notional Amount	$ 907,000	$ 1,594,000
Effective Date	Sep. 30, 2018	Dec. 31, 2017
Maturity Date	Nov. 30, 2018	Jan. 31, 2018
Index	USD/JPY	USD/JPY
Weighted Average Foreign Exchange Rate | $ / ¥	113.16	112.35
Derivative Six
Derivative [Line Items]
Notional Amount	$ 47,435,000	$ 30,594,000
Effective Date	Sep. 30, 2018	Dec. 31, 2017
Maturity Date	Nov. 30, 2018	Jan. 31, 2018
Index	USD/TWD	USD/TWD
Weighted Average Foreign Exchange Rate | $ / $	30.392	29.406

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Information Related to Number of and Notional Amount of Interest Rate Related Derivative Instruments (Details) - Interest Rate Swaps and Collars - Designated as Hedging Instrument - Cash Flow Hedges	Sep. 30, 2018USD ($)DerivativeInstrument	Dec. 31, 2017USD ($)DerivativeInstrument
Derivative [Line Items]
Number of Instruments | DerivativeInstrument	12	14
Notional Amount | $	$ 210,000,000	$ 220,000,000

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Fair Value of Interest Rate Related Derivative Financial Instruments and Their Classification on Condensed Consolidated Balance Sheets (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other Current Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives	$ 2,096	$ 486
Other Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives	$ 5,477	$ 3,398

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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	$ 636	$ 472	$ 4,143	$ (72)
Location of Gain or (Loss) Reclassified from Accumulated OCI into Income			Interest expense
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Net Income	299	86	$ 526	509
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts
Derivative Instruments Gain Loss [Line Items]
Amount of Gain or (Loss) Recognized in Net Income	$ (2,200)	$ 542	$ (7,570)	$ 472
Location of Gain or (Loss) Recognized in Net Income			Foreign currency (loss) gain, net

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Details) - Deferred Compensation Plan - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
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, 2018 and December 31, 2017, these investments totaled approximately $10.5 million and $8.8 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	$ 10.5	$ 8.8

Related Parties - Additional In

Related Parties - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Lite On Semiconductor
Related Party Transaction [Line Items]
Related Party ownership of common stock	15.50%		15.50%
Related Party Transaction, Description of Transaction			LSC is our largest stockholder, owning approximately 15.5% of our outstanding Common Stock as of September 30, 2018, 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 fees for services and consulting	$ 3.8	$ 4.5	$ 12.6	$ 12.4
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 S

Related Parties - Schedule of Sales and Purchases of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Lite On Semiconductor
Related Party Transaction [Line Items]
Net sales from related parties	$ 304	$ 329	$ 896	$ 1,064
Purchases from related parties	5,208	6,097	16,630	19,258
Nuvoton
Related Party Transaction [Line Items]
Purchases from related parties	2,361	3,202	7,774	9,487
Keylink
Related Party Transaction [Line Items]
Net sales from related parties	4,684	2,690	8,762	6,925
Purchases from related parties	907	1,069	2,646	3,090
JCP
Related Party Transaction [Line Items]
Purchases from related parties	$ 201	$ 322	$ 488	$ 844

Related Parties - Schedule of A

Related Parties - Schedule of Account Receivable and Payable of Related Party Transactions (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Lite On Semiconductor
Related Party Transaction [Line Items]
Accounts receivable	$ 304	$ 342
Accounts payable	3,025	3,308
Keylink
Related Party Transaction [Line Items]
Accounts receivable	6,186	4,089
Accounts payable	4,384	5,016
Nuvoton
Related Party Transaction [Line Items]
Accounts payable	1,203	1,121
JCP
Related Party Transaction [Line Items]
Accounts payable	$ 174	$ 317

Restructuring Costs - Additiona

Restructuring Costs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost And Reserve [Line Items]
Separation costs	$ 2,039	$ 206	$ 6,108
KFAB Wafer Manufacturing Operations
Restructuring Cost And Reserve [Line Items]
Restructuring activities description		In February 2017, the Company announced its plan to transfer its wafer fabrication operation located in Lee’s Summit, MO. (“KFAB”) to other Company-owned wafer fabrication plants and external foundries. The Company ceased production operations at KFAB late in third quarter 2017 and vacated the premises in November 2017.
Proceeds from insurance settlement		$ 3,700	6,000
Separation costs	$ 2,039	206	6,108
KFAB Wafer Manufacturing Operations | Cost of Goods Sold
Restructuring Cost And Reserve [Line Items]
Proceeds from insurance settlement			4,200
KFAB Wafer Manufacturing Operations | Other Income
Restructuring Cost And Reserve [Line Items]
Proceeds from insurance settlement		$ 3,700	1,800
KFAB Wafer Manufacturing Operations | Cost of Goods Sold
Restructuring Cost And Reserve [Line Items]
Separation costs			500
KFAB Wafer Manufacturing Operations | Selling, General and Administrative Expense
Restructuring Cost And Reserve [Line Items]
Separation costs			90
KFAB Wafer Manufacturing Operations | Research and Development Expense
Restructuring Cost And Reserve [Line Items]
Separation costs			$ 20

Restructuring Costs - Schedule

Restructuring Costs - Schedule of Restructuring Costs, Recorded in Restructuring Expense in Condensed Consolidated Statements of Operations, Incurred (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	$ 2,039	$ 206	$ 6,108
KFAB Wafer Manufacturing Operations
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	2,039	206	6,108
KFAB Wafer Manufacturing Operations | Early Supply Contract Termination
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown			1,985
KFAB Wafer Manufacturing Operations | Cost of Equipment Relocation
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	429	220	501
KFAB Wafer Manufacturing Operations | Asset Retirement Obligation
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	701		935
KFAB Wafer Manufacturing Operations | Retention Costs
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	$ 909	$ (14)	$ 2,687

Restructuring Costs - Schedul_2

Restructuring Costs - Schedule of Costs Accrued and Paid Related to Restructuring (Details) - KFAB Wafer Manufacturing Operations $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning balance, January 1, 2018	$ 1,304
Costs accrued	512
Restructuring costs paid	(1,816)
Retention Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance, January 1, 2018	659
Costs accrued	(14)
Restructuring costs paid	(645)
Equipment Relocation
Restructuring Cost And Reserve [Line Items]
Beginning balance, January 1, 2018	645
Costs accrued	526
Restructuring costs paid	$ (1,171)

Restructuring Costs - Schedul_3

Restructuring Costs - Schedule of Asset Retirement Obligation Related to Restructuring (Details) - KFAB Wafer Manufacturing Operations $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Restructuring Cost And Reserve [Line Items]
Asset retirement obligation, January 1, 2018	$ 389
Reversal of accrual	$ (389)

ERIS Acquisition - Additional I

ERIS Acquisition - Additional Information (Details) - ERIS Technology Corporation $ in Thousands	Jul. 31, 2018USD ($)
Business Acquisition [Line Items]
Ownership percentage in subsidiary	60.00%
Yea Shin Technology
Business Acquisition [Line Items]
Percentage of shares acquired by subsidiary in acquiree	60.00%
Outstanding shares acquired by subsidiary in cash	$ 6,400
Yong Xiang Development Corporation
Business Acquisition [Line Items]
Total purchase price for business acquisition	25,500
Lease monthly payment for first 8.5 months	40
Lease monthly payment for the remaining period	30
Total lease commitment	$ 1,100
Lease expiration date	Dec. 31, 2020