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v3.8.0.1

Segment Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of reportable segments | Segment | 5 |  |  |  |  |  |
Product Sales | $ 716,756 |  |  |  | $ 604,795 |  |
Royalty Revenues | 39 |  |  |  | 6 |  |
Total Revenue | 716,795 | $ 673,462 | $ 677,941 | $ 643,164 | 604,801 | $ 2,599,368 | $ 2,317,328
Gross Margin | 205,300 | 177,376 | 190,147 | 173,837 | 161,749 | 703,109 | 573,822
Segment Operating Income | 172,178 |  |  |  | 130,510 |  |
Restructuring and severance Costs | 0 |  |  |  | (1,469) |  |
Operating income | 104,062 | 76,006 | 95,416 | 85,005 | 67,578 | 324,005 | 197,058
Unallocated Other Income (Expense) | (12,043) | (8,981) | (9,228) | (9,296) | (17,136) | (44,641) | (102,842)
Income before taxes | 92,019 | $ 67,025 | $ 86,188 | $ 75,709 | 50,442 | 279,364 | 94,216
Distributors [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 404,060 |  |  |  | 345,703 | 1,484,276 | 1,280,060
OEMs [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 264,050 |  |  |  | 214,647 | 931,291 | 861,322
EMS companies [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 48,685 |  |  |  | 44,451 | 183,801 | 175,946
Industrial [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 280,212 |  |  |  | 216,766 | 934,631 | 796,031
Automotive [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 208,394 |  |  |  | 175,343 | 727,220 | 640,767
Telecommunications [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 45,924 |  |  |  | 45,835 | 190,682 | 193,456
Computing [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 47,431 |  |  |  | 41,070 | 198,850 | 172,481
Consumer Products [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 37,259 |  |  |  | 29,607 | 145,243 | 150,741
Power Supplies [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 34,243 |  |  |  | 34,858 | 160,038 | 132,555
Military and Aerospace [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 35,214 |  |  |  | 33,176 | 132,898 | 128,523
Medical [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 28,118 |  |  |  | 28,146 | 109,806 | 102,774
Asia [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 285,478 |  |  |  | 257,058 | 1,091,107 | 948,195
Americas [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 163,935 |  |  |  | 141,718 | 605,904 | 558,590
Europe [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenue | 267,382 |  |  |  | 206,025 | $ 902,357 | $ 810,543
MOSFETS Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Product Sales | 127,494 |  |  |  | 104,842 |  |
Royalty Revenues | 12 |  |  |  | 0 |  |
Total Revenue | 127,506 |  |  |  | 104,842 |  |
Gross Margin | 32,022 |  |  |  | 20,717 |  |
Segment Operating Income | 22,558 |  |  |  | 11,803 |  |
Diodes Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Product Sales | 167,017 |  |  |  | 144,585 |  |
Royalty Revenues | 0 |  |  |  | 0 |  |
Total Revenue | 167,017 |  |  |  | 144,585 |  |
Gross Margin | 43,200 |  |  |  | 38,162 |  |
Segment Operating Income | 37,931 |  |  |  | 33,442 |  |
Optoelectronic Components Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Product Sales | 71,958 |  |  |  | 65,262 |  |
Royalty Revenues | 0 |  |  |  | 0 |  |
Total Revenue | 71,958 |  |  |  | 65,262 |  |
Gross Margin | 27,233 |  |  |  | 22,442 |  |
Segment Operating Income | 22,794 |  |  |  | 17,117 |  |
Resistors And Inductors Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Product Sales | 244,019 |  |  |  | 200,246 |  |
Royalty Revenues | 27 |  |  |  | 6 |  |
Total Revenue | 244,046 |  |  |  | 200,252 |  |
Gross Margin | 78,530 |  |  |  | 61,215 |  |
Segment Operating Income | 70,002 |  |  |  | 53,958 |  |
Capacitors Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Product Sales | 106,268 |  |  |  | 89,860 |  |
Royalty Revenues | 0 |  |  |  | 0 |  |
Total Revenue | 106,268 |  |  |  | 89,860 |  |
Gross Margin | 24,315 |  |  |  | 19,213 |  |
Segment Operating Income | 18,893 |  |  |  | 14,190 |  |
Unallocated Amount to Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Segment Operating Income | (68,116) |  |  |  | (61,463) |  |
Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Segment Operating Income | 172,178 |  |  |  | 130,510 |  |
Unallocated Amount to Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Restructuring and severance Costs | 0 |  |  |  | (1,469) |  |
Unallocated Other Income (Expense) | $ (12,043) |  |  |  | $ (17,136) |  |

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