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Segment and Geographic Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 29, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments | Segment |  |  |  |  |  |  |  |  | 5 |  |
Segment Operating Income Description |  |  |  |  |  |  |  |  | The Company evaluates business segment performance on operating income, exclusive of certain items ("segment operating income"). Only dedicated, direct selling, general, and administrative expenses of the segments are included in the calculation of segment operating income. The Company's calculation of segment operating income excludes such selling, general, and administrative costs as global operations, sales and marketing, information systems, finance and administration groups, as well as restructuring and severance costs, goodwill and long-lived asset impairment charges, and other items. Management believes that evaluating segment performance excluding such items is meaningful because it provides insight with respect to intrinsic operating results of the Company. These items represent reconciling items between segment operating income and consolidated operating income. Business segment assets are the owned or allocated assets used by each business. |  |
Segment Operating Income |  |  |  |  |  |  |  |  | $ 755,888 | $ 581,740 | $ 446,310
Total revenue | $ 775,892 | $ 780,972 | $ 761,030 | $ 716,795 | $ 673,462 | $ 677,941 | $ 643,164 | $ 604,801 | 3,034,689 | 2,599,368 | 2,317,328
Gross profit | 219,690 | $ 236,296 | $ 227,238 | $ 205,300 | 177,376 | $ 190,147 | $ 173,837 | $ 161,749 | 888,524 | 703,109 | 573,822
Depreciation expense |  |  |  |  |  |  |  |  | 150,056 | 148,883 | 144,521
Capital expenditures |  |  |  |  |  |  |  |  | 229,899 | 170,432 | 134,635
Total Assets | 3,106,198 |  |  |  | 3,462,089 |  |  |  | 3,106,198 | 3,462,089 | 3,080,701
EMS companies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 207,135 | 183,801 | 175,946
OEMs [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,085,292 | 931,291 | 861,322
Distributors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,742,262 | 1,484,276 | 1,280,060
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,139,880 | 934,631 | 796,031
Automotive [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 861,436 | 727,220 | 640,767
Telecommunications [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 200,379 | 190,682 | 193,456
Computing [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 228,831 | 198,850 | 172,481
Consumer Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 168,884 | 145,243 | 150,741
Power Supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 144,433 | 160,038 | 132,555
Military and Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 162,921 | 132,898 | 128,523
Medical [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 127,925 | 109,806 | 102,774
Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 3,034,689 | 2,599,368 | 2,317,328
Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,171,815 | 1,060,560 | 939,144
Asia [Member] | Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,193,827 | 1,091,107 | 948,195
Europe [Member] | Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,081,073 | 902,357 | 810,543
Americas [Member] | Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 759,789 | 605,904 | 558,590
MOSFETS Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 106,955 | 74,174 | 22,536
Total revenue |  |  |  |  |  |  |  |  | 547,643 | 467,476 | 405,949
Gross profit |  |  |  |  |  |  |  |  | 145,923 | 109,603 | 58,431
Depreciation expense |  |  |  |  |  |  |  |  | 32,104 | 34,731 | 34,531
Capital expenditures |  |  |  |  |  |  |  |  | 49,557 | 33,475 | 22,430
Total Assets | 444,356 |  |  |  | 412,598 |  |  |  | 444,356 | 412,598 | 389,482
Diodes Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 175,752 | 145,645 | 115,873
Total revenue |  |  |  |  |  |  |  |  | 712,936 | 619,958 | 552,766
Gross profit |  |  |  |  |  |  |  |  | 196,702 | 165,176 | 136,580
Depreciation expense |  |  |  |  |  |  |  |  | 38,197 | 37,396 | 35,335
Capital expenditures |  |  |  |  |  |  |  |  | 57,756 | 38,681 | 29,860
Total Assets | 804,784 |  |  |  | 792,610 |  |  |  | 804,784 | 792,610 | 714,898
Optoelectronic Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 82,681 | 80,499 | 68,246
Total revenue |  |  |  |  |  |  |  |  | 289,727 | 284,429 | 269,162
Gross profit |  |  |  |  |  |  |  |  | 100,219 | 98,000 | 87,516
Depreciation expense |  |  |  |  |  |  |  |  | 16,612 | 16,871 | 15,549
Capital expenditures |  |  |  |  |  |  |  |  | 19,935 | 16,115 | 18,276
Total Assets | 342,656 |  |  |  | 332,228 |  |  |  | 342,656 | 332,228 | 312,423
Resistors And Inductors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 303,571 | 222,878 | 193,241
Total revenue |  |  |  |  |  |  |  |  | 1,018,286 | 843,529 | 753,524
Gross profit |  |  |  |  |  |  |  |  | 337,268 | 251,905 | 224,352
Depreciation expense |  |  |  |  |  |  |  |  | 37,708 | 34,083 | 32,240
Capital expenditures |  |  |  |  |  |  |  |  | 80,862 | 67,007 | 47,006
Total Assets | 874,835 |  |  |  | 994,639 |  |  |  | 874,835 | 994,639 | 907,995
Capacitors Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 86,929 | 58,544 | 46,414
Total revenue |  |  |  |  |  |  |  |  | 466,097 | 383,976 | 335,927
Gross profit |  |  |  |  |  |  |  |  | 108,412 | 78,425 | 66,943
Depreciation expense |  |  |  |  |  |  |  |  | 17,745 | 17,736 | 17,817
Capital expenditures |  |  |  |  |  |  |  |  | 12,200 | 11,135 | 14,410
Total Assets | 487,540 |  |  |  | 568,113 |  |  |  | 487,540 | 568,113 | 495,925
Corporate Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross profit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation expense |  |  |  |  |  |  |  |  | 7,690 | 8,066 | 9,049
Capital expenditures |  |  |  |  |  |  |  |  | 9,589 | 4,019 | 2,653
Total Assets | $ 152,027 |  |  |  | $ 361,901 |  |  |  | 152,027 | 361,901 | 259,978
Unallocated Amount to Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income |  |  |  |  |  |  |  |  | $ (270,768) | $ (246,462) | $ (228,494)

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