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Segment and Geographic Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Oct. 03, 2015 USD ($) | Jul. 04, 2015 USD ($) | Apr. 04, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 27, 2014 USD ($) | Jun. 28, 2014 USD ($) | Mar. 29, 2014 USD ($) | Dec. 31, 2015 USD ($) Segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 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 |  |  |  |  |  |  |  |  | $ 2,297,165 | $ 2,488,757 | $ 2,364,617
Royalty revenues |  |  |  |  |  |  |  |  | 3,323 | 4,525 | 6,362
Total revenue | $ 555,928 | $ 560,654 | $ 590,470 | $ 593,436 | $ 610,764 | $ 638,211 | $ 641,929 | $ 602,378 | 2,300,488 | 2,493,282 | 2,370,979
Gross Margin | 125,556 | 130,144 | 141,482 | 145,038 | 143,524 | 158,392 | 164,093 | 145,283 | 542,220 | 611,292 | 567,260
Depreciation expense |  |  |  |  |  |  |  |  | 154,340 | 160,804 | 155,064
Interest expense (income) |  |  |  |  |  |  |  |  | 25,685 | 24,457 | 23,130
Capital expenditures |  |  |  |  |  |  |  |  | 147,142 | 156,974 | 153,077
Total Assets | 3,152,986 |  |  |  | 3,274,151 |  |  |  | 3,152,986 | 3,274,151 | 3,224,455
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill and long-lived assets | 0 | (62,980) | 0 | 0 | 0 | 0 | 0 | 0 | (62,980) | 0 | 0
Restructuring and severance costs | (9,821) | (2,324) | (5,660) | (1,410) | (1,971) | (3,508) | (9,014) | (6,404) | (19,215) | (20,897) | (2,814)
U.S. pension settlement charges | 0 | $ 0 | $ 0 | $ 0 | 0 | $ (15,588) | $ 0 | $ 0 | 0 | (15,588) | 0
Executive Compensation Credit (Charges) |  |  |  |  |  |  |  |  | 0 | 0 | 1,778
Segment Operating Income |  |  |  |  |  |  |  |  | 97,799 | 189,111 | 197,682
MOSFETS Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 426,672 | 470,377 | 449,299
Royalty revenues |  |  |  |  |  |  |  |  | 11 | 160 | 178
Total revenue |  |  |  |  |  |  |  |  | 426,683 | 470,537 | 449,477
Gross Margin |  |  |  |  |  |  |  |  | 58,626 | 59,614 | 59,387
Depreciation expense |  |  |  |  |  |  |  |  | 47,172 | 53,939 | 50,606
Interest expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 29,289 | 33,672 | 41,869
Total Assets | 477,984 |  |  |  | 499,550 |  |  |  | 477,984 | 499,550 | 543,037
Diodes Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 533,931 | 579,288 | 547,264
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 533,931 | 579,288 | 547,264
Gross Margin |  |  |  |  |  |  |  |  | 119,762 | 132,021 | 121,231
Depreciation expense |  |  |  |  |  |  |  |  | 35,526 | 39,592 | 37,305
Interest expense (income) |  |  |  |  |  |  |  |  | 11 | 21 | 54
Capital expenditures |  |  |  |  |  |  |  |  | 38,971 | 41,713 | 44,431
Total Assets | 718,548 |  |  |  | 732,502 |  |  |  | 718,548 | 732,502 | 788,121
Optoelectronic Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 279,553 | 258,248 | 228,194
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 51
Total revenue |  |  |  |  |  |  |  |  | 279,553 | 258,248 | 228,245
Gross Margin |  |  |  |  |  |  |  |  | 88,625 | 91,165 | 76,732
Depreciation expense |  |  |  |  |  |  |  |  | 14,118 | 13,266 | 12,484
Interest expense (income) |  |  |  |  |  |  |  |  | 20 | 41 | 122
Capital expenditures |  |  |  |  |  |  |  |  | 21,853 | 23,008 | 18,310
Total Assets | 325,600 |  |  |  | 422,257 |  |  |  | 325,600 | 422,257 | 213,128
Resistors And Inductors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 704,109 | 755,251 | 700,115
Royalty revenues |  |  |  |  |  |  |  |  | 3,312 | 4,365 | 6,133
Total revenue |  |  |  |  |  |  |  |  | 707,421 | 759,616 | 706,248
Gross Margin |  |  |  |  |  |  |  |  | 208,384 | 241,090 | 221,851
Depreciation expense |  |  |  |  |  |  |  |  | 30,576 | 32,380 | 31,998
Interest expense (income) |  |  |  |  |  |  |  |  | 113 | 119 | 79
Capital expenditures |  |  |  |  |  |  |  |  | 38,169 | 42,950 | 32,515
Total Assets | 839,249 |  |  |  | 812,664 |  |  |  | 839,249 | 812,664 | 843,685
Capacitors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 352,900 | 425,593 | 439,745
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 352,900 | 425,593 | 439,745
Gross Margin |  |  |  |  |  |  |  |  | 66,823 | 87,402 | 88,059
Depreciation expense |  |  |  |  |  |  |  |  | 18,168 | 20,524 | 21,596
Interest expense (income) |  |  |  |  |  |  |  |  | 13 | 18 | 28
Capital expenditures |  |  |  |  |  |  |  |  | 14,763 | 12,694 | 13,052
Total Assets | 543,507 |  |  |  | 605,281 |  |  |  | 543,507 | 605,281 | 636,637
Corporate Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Royalty revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross Margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation expense |  |  |  |  |  |  |  |  | 8,780 | 1,103 | 1,075
Interest expense (income) |  |  |  |  |  |  |  |  | 25,528 | 24,258 | 22,847
Capital expenditures |  |  |  |  |  |  |  |  | 4,097 | 2,937 | 2,900
Total Assets | $ 248,098 |  |  |  | $ 201,897 |  |  |  | 248,098 | 201,897 | 199,847
Operating Segments [Member] | MOSFETS Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 21,366 | 21,095 | 19,140
Operating Segments [Member] | Diodes Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 95,887 | 106,068 | 96,581
Operating Segments [Member] | Optoelectronic Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 68,410 | 73,463 | 62,259
Operating Segments [Member] | Resistors And Inductors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 173,805 | 203,343 | 186,583
Operating Segments [Member] | Capacitors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 44,863 | 62,460 | 64,494
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Operating margin reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill and long-lived assets |  |  |  |  |  |  |  |  | (62,980) | 0 | 0
Restructuring and severance costs |  |  |  |  |  |  |  |  | (19,215) | (20,897) | (2,814)
U.S. pension settlement charges |  |  |  |  |  |  |  |  | 0 | (15,588) | 0
Executive Compensation Credit (Charges) |  |  |  |  |  |  |  |  | 0 | 0 | 1,778
Segment Operating Income |  |  |  |  |  |  |  |  | $ (224,337) | $ (240,833) | $ (230,339)

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