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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments |  |  | 5 |
Product Sales | $ 596,070 | $ 586,667 | $ 1,148,344 | $ 1,123,294
Royalty Revenues | 1,595 | 1,532 | 3,575 | 3,452
Total Revenue | 597,665 | 588,199 | 1,151,919 | 1,126,746
Gross Margin | 142,857 | 147,619 | 279,591 | 284,328
Gain on Sale of Property | 0 | 12,153 | 0 | 12,153
Executive compensation credit (charge) | 1,778 | 0 | 1,778 | 0
Operating Income (Loss) | 51,890 | 72,883 | 97,495 | 123,228
MOSFETS Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 115,484 | 111,326 | 216,330 | 206,027
Royalty Revenues | 79 | 37 | 121 | 174
Total Revenue | 115,563 | 111,363 | 216,451 | 206,201
Gross Margin | 16,466 | 18,709 | 29,366 | 29,326
Segment Operating Income | 5,682 | 8,676 | 8,515 | 9,999
Diodes Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 140,623 | 136,008 | 265,735 | 256,142
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 140,623 | 136,008 | 265,735 | 256,142
Gross Margin | 31,427 | 28,676 | 58,688 | 53,730
Segment Operating Income | 25,339 | 22,682 | 46,728 | 42,041
Optoelectronic Components Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 58,397 | 58,083 | 114,623 | 108,695
Royalty Revenues | 0 | 0 | 0 | 27
Total Revenue | 58,397 | 58,083 | 114,623 | 108,722
Gross Margin | 19,151 | 18,605 | 38,925 | 35,899
Segment Operating Income | 15,558 | 15,192 | 31,767 | 29,237
Resistors And Inductors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 169,817 | 164,903 | 333,745 | 322,157
Royalty Revenues | 1,516 | 1,495 | 3,454 | 3,251
Total Revenue | 171,333 | 166,398 | 337,199 | 325,408
Gross Margin | 54,345 | 55,073 | 106,946 | 109,332
Segment Operating Income | 45,540 | 46,688 | 89,740 | 93,200
Capacitors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 111,749 | 116,347 | 217,911 | 230,273
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 111,749 | 116,347 | 217,911 | 230,273
Gross Margin | 21,468 | 26,556 | 45,666 | 56,041
Segment Operating Income | 15,585 | 20,951 | 34,041 | 44,868
Unallocated Amount to Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | $ (57,592) | $ (53,459) | $ (115,074) | $ (108,270)

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