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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 Segment | Sep. 28, 2013
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments |  |  | 5 |
Product Sales | $ 637,148 | $ 601,524 | $ 1,879,268 | $ 1,749,868
Royalty Revenues | 1,063 | 1,366 | 3,250 | 4,941
Total Revenue | 638,211 | 602,890 | 1,882,518 | 1,754,809
Gross Margin | 158,392 | 143,220 | 467,768 | 422,811
U.S. pension settlement charges | (15,588) | 0 | (15,588) | 0
Segment Operating Income | 45,459 | 53,153 | 145,954 | 150,648
Operating Income (Loss) | 45,459 | 53,153 | 145,954 | 150,648
Restructuring and severance Costs | (3,508) | 0 | (18,926) | 0
MOSFETS Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 121,631 | 115,143 | 358,715 | 331,473
Royalty Revenues | 28 | 25 | 127 | 146
Total Revenue | 121,659 | 115,168 | 358,842 | 331,619
Gross Margin | 17,384 | 15,735 | 48,872 | 45,101
Diodes Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 151,444 | 140,790 | 437,944 | 406,525
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 151,444 | 140,790 | 437,944 | 406,525
Gross Margin | 36,135 | 32,405 | 100,606 | 91,093
Optoelectronic Components Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 67,549 | 56,796 | 188,305 | 171,419
Royalty Revenues | 0 | 51 | 0 | 51
Total Revenue | 67,549 | 56,847 | 188,305 | 171,470
Gross Margin | 24,585 | 20,163 | 68,610 | 59,088
Resistors And Inductors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 189,419 | 176,885 | 569,944 | 510,630
Royalty Revenues | 1,035 | 1,290 | 3,123 | 4,744
Total Revenue | 190,454 | 178,175 | 573,067 | 515,374
Gross Margin | 59,581 | 54,093 | 181,096 | 161,039
Capacitors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product Sales | 107,105 | 111,910 | 324,360 | 329,821
Royalty Revenues | 0 | 0 | 0 | 0
Total Revenue | 107,105 | 111,910 | 324,360 | 329,821
Gross Margin | 20,707 | 20,824 | 68,584 | 66,490
Operating Segments [Member] | MOSFETS Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | 7,824 | 5,313 | 19,804 | 13,828
Operating Segments [Member] | Diodes Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | 29,720 | 26,240 | 80,908 | 72,968
Operating Segments [Member] | Optoelectronic Components Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | 20,571 | 16,492 | 56,920 | 48,259
Operating Segments [Member] | Resistors And Inductors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | 50,194 | 45,096 | 152,499 | 134,836
Operating Segments [Member] | Capacitors Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | 14,482 | 14,879 | 49,945 | 48,920
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
U.S. pension settlement charges | (15,588) | 0 | (15,588) | 0
Executive compensation credit (charge) | 0 | 0 | 0 | 1,778
Restructuring and severance Costs | (3,508) | 0 | (18,926) | 0
Segment Reconciling Items [Member] | Unallocated Amount to Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Income | $ (58,236) | $ (54,867) | $ (179,608) | $ (169,941)

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- Definition Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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