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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2013 | Sep. 29, 2012 | Sep. 28, 2013 | Sep. 29, 2012
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | 5 |  |  |
Product Sales | $ 601,524 | $ 571,012 | $ 1,749,868 | $ 1,694,306
Royalty Revenues | 1,366 | 1,769 | 4,941 | 5,221
Total Revenue | 602,890 | 572,781 | 1,754,809 | 1,699,527
Gross Margin | 143,220 | 133,554 | 422,811 | 417,882
Gain on Sale of Property | 0 | 0 | 0 | 12,153
Executive compensation credit (charge) | 0 | 0 | 1,778 | 0
Operating Income (Loss) | 53,153 | 44,459 | 150,648 | 167,687
MOSFETS Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 115,143 | 123,289 | 331,473 | 329,316
Royalty Revenues | 25 | 36 | 146 | 210
Total Revenue | 115,168 | 123,325 | 331,619 | 329,526
Gross Margin | 15,735 | 17,402 | 45,101 | 46,728
Segment Operating Income | 5,313 | 7,127 | 13,828 | 17,126
Diodes Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 140,790 | 124,108 | 406,525 | 380,250
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 140,790 | 124,108 | 406,525 | 380,250
Gross Margin | 32,405 | 25,209 | 91,093 | 78,939
Segment Operating Income | 26,240 | 19,432 | 72,968 | 61,473
Optoelectronic Components Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 56,796 | 50,205 | 171,419 | 158,900
Royalty Revenues | 51 | 0 | 51 | 27
Total Revenue | 56,847 | 50,205 | 171,470 | 158,927
Gross Margin | 20,163 | 15,563 | 59,088 | 51,462
Segment Operating Income | 16,492 | 12,420 | 48,259 | 41,657
Resistors And Inductors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 176,885 | 161,979 | 510,630 | 484,136
Royalty Revenues | 1,290 | 1,733 | 4,744 | 4,984
Total Revenue | 178,175 | 163,712 | 515,374 | 489,120
Gross Margin | 54,093 | 51,254 | 161,039 | 160,586
Segment Operating Income | 45,096 | 43,617 | 134,836 | 136,817
Capacitors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 111,910 | 111,431 | 329,821 | 341,704
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 111,910 | 111,431 | 329,821 | 341,704
Gross Margin | 20,824 | 24,126 | 66,490 | 80,167
Segment Operating Income | 14,879 | 19,033 | 48,920 | 63,901
Unallocated Amount to Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | $ (54,867) | $ (57,170) | $ (169,941) | $ (165,440)

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