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Segment and Geographic Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Dec. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments | Segment |  |  |  |  |  |  |  |  | 5 |  |
Segment Operating Income Description |  |  |  |  |  |  |  |  | The Company evaluates business segment performance on operating income, exclusive of certain items ("segment operating income"). Only dedicated, direct selling, general, and administrative expenses of the segments are included in the calculation of segment operating income. The Company's calculation of segment operating income excludes such selling, general, and administrative costs as global operations, sales and marketing, information systems, finance and administration groups, as well as restructuring and severance costs, goodwill and long-lived asset impairment charges, and other items. Management believes that evaluating segment performance excluding such items is meaningful because it provides insight with respect to intrinsic operating results of the Company. These items represent reconciling items between segment operating income and consolidated operating income. Business segment assets are the owned or allocated assets used by each business. |  |
Product sales |  |  |  |  |  |  |  |  | $ 2,603,428 | $ 2,323,172 | $ 2,297,165
Royalty revenues |  |  |  |  |  |  |  |  | 94 | 259 | 3,323
Total revenue | $ 674,489 | $ 677,883 | $ 644,892 | $ 606,258 | $ 570,819 | $ 591,955 | $ 590,051 | $ 570,606 | 2,603,522 | 2,323,431 | 2,300,488
Gross profit | 176,501 | 189,273 | 172,963 | 160,875 | 132,445 | 153,901 | 146,128 | 137,309 | 699,612 | 569,783 | 542,220
Depreciation expense |  |  |  |  |  |  |  |  | 148,883 | 144,521 | 154,340
Capital expenditures |  |  |  |  |  |  |  |  | 170,432 | 134,635 | 147,142
Total Assets | 3,459,189 |  |  |  | 3,077,801 |  |  |  | 3,459,189 | 3,077,801 | 3,152,986
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets | 0 | 0 | 0 | 0 | 0 | (1,559) | 0 | 0 | 0 | (1,559) | (57,600)
Impairment of goodwill |  |  |  |  |  |  |  |  | 0 | 0 | (5,380)
Restructuring and severance costs | (6,079) | (3,244) | (481) | (1,469) | (7,060) | (1,197) | (4,467) | (6,475) | (11,273) | (19,199) | (19,215)
U.S. pension settlement charges | 0 | 0 | 0 | 0 | (79,321) | 0 | 0 | 0 | 0 | (79,321) | 0
Segment Operating Income |  |  |  |  |  |  |  |  | 577,634 | 441,418 | 404,331
Consolidated Operating Income | 72,536 | $ 92,328 | $ 82,036 | $ 64,688 | (45,468) | $ 57,229 | $ 49,408 | $ 40,548 | 311,588 | 101,717 | 97,799
Unallocated Other Income (Expense) |  |  |  |  |  |  |  |  | (32,224) | (7,501) | (23,059)
Income before taxes |  |  |  |  |  |  |  |  | 279,364 | 94,216 | 74,740
MOSFETS Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 468,294 | 406,336 | 426,672
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 11
Total revenue |  |  |  |  |  |  |  |  | 468,294 | 406,336 | 426,683
Gross profit |  |  |  |  |  |  |  |  | 109,436 | 58,155 | 58,626
Depreciation expense |  |  |  |  |  |  |  |  | 34,731 | 34,531 | 47,172
Capital expenditures |  |  |  |  |  |  |  |  | 33,475 | 22,430 | 29,289
Total Assets | 412,598 |  |  |  | 389,482 |  |  |  | 412,598 | 389,482 | 477,984
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 74,002 | 22,254 | 21,366
Diodes Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 620,888 | 553,920 | 533,931
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 620,888 | 553,920 | 533,931
Gross profit |  |  |  |  |  |  |  |  | 162,645 | 134,937 | 119,762
Depreciation expense |  |  |  |  |  |  |  |  | 37,396 | 35,335 | 35,526
Capital expenditures |  |  |  |  |  |  |  |  | 38,681 | 29,860 | 38,971
Total Assets | 792,610 |  |  |  | 714,898 |  |  |  | 792,610 | 714,898 | 718,548
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 142,833 | 113,995 | 95,887
Optoelectronic Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 286,349 | 272,126 | 279,553
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 286,349 | 272,126 | 279,553
Gross profit |  |  |  |  |  |  |  |  | 97,436 | 87,022 | 88,625
Depreciation expense |  |  |  |  |  |  |  |  | 16,871 | 15,549 | 14,118
Capital expenditures |  |  |  |  |  |  |  |  | 16,115 | 18,276 | 21,853
Total Assets | 332,228 |  |  |  | 312,423 |  |  |  | 332,228 | 312,423 | 325,600
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 79,691 | 67,548 | 68,410
Resistors And Inductors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 843,965 | 753,578 | 704,109
Royalty revenues |  |  |  |  |  |  |  |  | 94 | 259 | 3,312
Total revenue |  |  |  |  |  |  |  |  | 844,059 | 753,837 | 707,421
Gross profit |  |  |  |  |  |  |  |  | 251,725 | 222,786 | 208,384
Depreciation expense |  |  |  |  |  |  |  |  | 34,083 | 32,240 | 30,576
Capital expenditures |  |  |  |  |  |  |  |  | 67,007 | 47,006 | 38,169
Total Assets | 992,439 |  |  |  | 905,795 |  |  |  | 992,439 | 905,795 | 839,249
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 222,634 | 191,283 | 173,805
Capacitors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 383,932 | 337,212 | 352,900
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 383,932 | 337,212 | 352,900
Gross profit |  |  |  |  |  |  |  |  | 78,370 | 66,883 | 66,823
Depreciation expense |  |  |  |  |  |  |  |  | 17,736 | 17,817 | 18,168
Capital expenditures |  |  |  |  |  |  |  |  | 11,135 | 14,410 | 14,763
Total Assets | 567,413 |  |  |  | 495,225 |  |  |  | 567,413 | 495,225 | 543,507
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 58,474 | 46,338 | 44,863
Corporate Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross profit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation expense |  |  |  |  |  |  |  |  | 8,066 | 9,049 | 8,780
Capital expenditures |  |  |  |  |  |  |  |  | 4,019 | 2,653 | 4,097
Total Assets | $ 361,901 |  |  |  | $ 259,978 |  |  |  | 361,901 | 259,978 | 248,098
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 577,634 | 441,418 | 404,331
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets |  |  |  |  |  |  |  |  | 0 | (1,559) | (57,600)
Impairment of goodwill |  |  |  |  |  |  |  |  | 0 | 0 | (5,380)
Restructuring and severance costs |  |  |  |  |  |  |  |  | (11,273) | (19,199) | (19,215)
U.S. pension settlement charges |  |  |  |  |  |  |  |  | 0 | (79,321) | 0
Segment Reconciling Items [Member] | Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | $ (254,773) | $ (239,622) | $ (224,337)

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