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Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2016 USD ($) | Oct. 03, 2015 USD ($) | Oct. 01, 2016 USD ($) Segment | Oct. 03, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | Segment |  |  | 5 |
Product Sales | $ 591,903 | $ 559,918 | $ 1,752,400 | $ 1,741,965
Royalty Revenues | 52 | 736 | 212 | 2,595
Total Revenue | 591,955 | 560,654 | 1,752,612 | 1,744,560
Gross Margin | 153,901 | 130,144 | 437,338 | 416,664
Segment Operating Income | 124,736 | 95,162 | 336,994 | 310,437
Restructuring and severance Costs | (1,197) | (2,324) | (12,139) | (9,394)
Impairment of Intangible Assets | 1,559 | 57,600 | 1,559 | 57,600
Impairment of goodwill | 0 | 5,380 | 0 | 5,380
Operating income | 57,229 | (24,155) | 147,185 | 67,573
Unallocated Other Income (Expense) | (6,545) | (8,787) | (11,649) | (17,264)
Income before taxes | 50,684 | (32,942) | 135,536 | 50,309
MOSFETS Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 101,687 | 109,446 | 304,839 | 322,553
Royalty Revenues | 0 | 0 | 0 | 11
Total Revenue | 101,687 | 109,446 | 304,839 | 322,564
Gross Margin | 16,443 | 16,795 | 40,914 | 45,261
Segment Operating Income | 7,493 | 6,839 | 12,671 | 16,506
Diodes Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 141,127 | 123,922 | 418,629 | 399,155
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 141,127 | 123,922 | 418,629 | 399,155
Gross Margin | 36,444 | 27,508 | 106,364 | 88,998
Segment Operating Income | 31,832 | 21,628 | 90,025 | 70,641
Optoelectronic Components Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 72,801 | 70,008 | 203,635 | 211,610
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 72,801 | 70,008 | 203,635 | 211,610
Gross Margin | 24,250 | 22,969 | 65,049 | 69,483
Segment Operating Income | 20,340 | 17,673 | 49,838 | 53,923
Resistors And Inductors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 191,989 | 172,995 | 568,122 | 538,173
Royalty Revenues | 52 | 736 | 212 | 2,584
Total Revenue | 192,041 | 173,731 | 568,334 | 540,757
Gross Margin | 58,768 | 49,843 | 171,808 | 162,034
Segment Operating Income | 51,861 | 41,404 | 147,315 | 135,399
Capacitors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 84,299 | 83,547 | 257,175 | 270,474
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 84,299 | 83,547 | 257,175 | 270,474
Gross Margin | 17,996 | 13,029 | 53,203 | 50,888
Segment Operating Income | 13,210 | 7,618 | 37,145 | 33,968
Unallocated Amount to Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | (64,751) | (54,013) | (176,111) | (170,490)
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | 124,736 | 95,162 | 336,994 | 310,437
Unallocated Amount to Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring and severance Costs | (1,197) | (2,324) | (12,139) | (9,394)
Impairment of Intangible Assets | (1,559) | (57,600) | (1,559) | (57,600)
Impairment of goodwill | 0 | (5,380) | 0 | (5,380)
Unallocated Other Income (Expense) | $ (6,545) | $ (8,787) | $ (11,649) | $ (17,264)

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