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Segment and Geographic Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Dec. 31, 2015 USD ($) | Oct. 03, 2015 USD ($) | Jul. 04, 2015 USD ($) | Apr. 04, 2015 USD ($) | Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 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 |  |  |  |  |  |  |  |  | $ 2,323,172 | $ 2,297,165 | $ 2,488,757
Royalty revenues |  |  |  |  |  |  |  |  | 259 | 3,323 | 4,525
Total revenue | $ 570,819 | $ 591,955 | $ 590,051 | $ 570,606 | $ 555,928 | $ 560,654 | $ 590,470 | $ 593,436 | 2,323,431 | 2,300,488 | 2,493,282
Gross profit | 132,445 | 153,901 | 146,128 | 137,309 | 125,556 | 130,144 | 141,482 | 145,038 | 569,783 | 542,220 | 611,292
Depreciation expense |  |  |  |  |  |  |  |  | 144,521 | 154,340 | 160,804
Capital expenditures |  |  |  |  |  |  |  |  | 134,635 | 147,142 | 156,974
Total Assets | 3,077,801 |  |  |  | 3,152,986 |  |  |  | 3,077,801 | 3,152,986 | 3,274,151
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets | 0 | (1,559) | 0 | 0 | 0 | (57,600) | 0 | 0 | (1,559) | (57,600) | 0
Impairment of goodwill | 0 | 0 | 0 | 0 | 0 | (5,380) | 0 | 0 | 0 | (5,380) | 0
Restructuring and severance costs | (7,060) | (1,197) | (4,467) | (6,475) | (9,821) | (2,324) | (5,660) | (1,410) | (19,199) | (19,215) | (20,897)
U.S. pension settlement charges | (79,321) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | (79,321) | 0 | (15,588)
Segment Operating Income |  |  |  |  |  |  |  |  | 441,418 | 404,331 | 466,429
Consolidated Operating Income | (45,468) | $ 57,229 | $ 49,408 | $ 40,548 | 30,226 | $ (24,155) | $ 44,170 | $ 47,558 | 101,717 | 97,799 | 189,111
Unallocated Other Income (Expense) |  |  |  |  |  |  |  |  | (7,501) | (23,059) | (21,968)
Income before taxes |  |  |  |  |  |  |  |  | 94,216 | 74,740 | 167,143
MOSFETS Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 406,336 | 426,672 | 470,377
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 11 | 160
Total revenue |  |  |  |  |  |  |  |  | 406,336 | 426,683 | 470,537
Gross profit |  |  |  |  |  |  |  |  | 58,155 | 58,626 | 59,614
Depreciation expense |  |  |  |  |  |  |  |  | 34,531 | 47,172 | 53,939
Capital expenditures |  |  |  |  |  |  |  |  | 22,430 | 29,289 | 33,672
Total Assets | 389,482 |  |  |  | 477,984 |  |  |  | 389,482 | 477,984 | 499,550
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 22,254 | 21,366 | 21,095
Diodes Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 553,920 | 533,931 | 579,288
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 553,920 | 533,931 | 579,288
Gross profit |  |  |  |  |  |  |  |  | 134,937 | 119,762 | 132,021
Depreciation expense |  |  |  |  |  |  |  |  | 35,335 | 35,526 | 39,592
Capital expenditures |  |  |  |  |  |  |  |  | 29,860 | 38,971 | 41,713
Total Assets | 714,898 |  |  |  | 718,548 |  |  |  | 714,898 | 718,548 | 732,502
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 113,995 | 95,887 | 106,068
Optoelectronic Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 272,126 | 279,553 | 258,248
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 272,126 | 279,553 | 258,248
Gross profit |  |  |  |  |  |  |  |  | 87,022 | 88,625 | 91,165
Depreciation expense |  |  |  |  |  |  |  |  | 15,549 | 14,118 | 13,266
Capital expenditures |  |  |  |  |  |  |  |  | 18,276 | 21,853 | 23,008
Total Assets | 312,423 |  |  |  | 325,600 |  |  |  | 312,423 | 325,600 | 422,257
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 0 |
Segment Operating Income |  |  |  |  |  |  |  |  | 67,548 | 68,410 | 73,463
Resistors And Inductors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 753,578 | 704,109 | 755,251
Royalty revenues |  |  |  |  |  |  |  |  | 259 | 3,312 | 4,365
Total revenue |  |  |  |  |  |  |  |  | 753,837 | 707,421 | 759,616
Gross profit |  |  |  |  |  |  |  |  | 222,786 | 208,384 | 241,090
Depreciation expense |  |  |  |  |  |  |  |  | 32,240 | 30,576 | 32,380
Capital expenditures |  |  |  |  |  |  |  |  | 47,006 | 38,169 | 42,950
Total Assets | 905,795 |  |  |  | 839,249 |  |  |  | 905,795 | 839,249 | 812,664
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 0 |
Segment Operating Income |  |  |  |  |  |  |  |  | 191,283 | 173,805 | 203,343
Capacitors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 337,212 | 352,900 | 425,593
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 337,212 | 352,900 | 425,593
Gross profit |  |  |  |  |  |  |  |  | 66,883 | 66,823 | 87,402
Depreciation expense |  |  |  |  |  |  |  |  | 17,817 | 18,168 | 20,524
Capital expenditures |  |  |  |  |  |  |  |  | 14,410 | 14,763 | 12,694
Total Assets | 495,225 |  |  |  | 543,507 |  |  |  | 495,225 | 543,507 | 605,281
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  | (5,380) |
Segment Operating Income |  |  |  |  |  |  |  |  | 46,338 | 44,863 | 62,460
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 |  |  |  |  |  |  |  |  | 9,049 | 8,780 | 1,103
Capital expenditures |  |  |  |  |  |  |  |  | 2,653 | 4,097 | 2,937
Total Assets | $ 259,978 |  |  |  | $ 248,098 |  |  |  | 259,978 | 248,098 | 201,897
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 441,418 | 404,331 | 466,429
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  | 0 | (5,380) | 0
Restructuring and severance costs |  |  |  |  |  |  |  |  | (19,199) | (19,215) | (20,897)
U.S. pension settlement charges |  |  |  |  |  |  |  |  | (79,321) | 0 | (15,588)
Segment Reconciling Items [Member] | Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | $ (239,622) | $ (224,337) | $ (240,833)

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