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Restructuring and Related Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, current | $ 2,538 |  |  |  | $ 7,352 |  |  |  | $ 2,538 | $ 7,352 |  |  |  |
Restructuring and related expenses | 0 | $ 0 | $ 0 | $ 0 | 6,079 | $ 3,244 | $ 481 | $ 1,469 | 0 | 11,273 | $ 19,199 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses | 0 | $ 0 | $ 0 | $ 0 | 6,079 | $ 3,244 | $ 481 | $ 1,469 | 0 | 11,273 | 19,199 |  |  |
Proceeds from sale of property and equipment |  |  |  |  |  |  |  |  | 55,561 | 1,685 | 5,701 |  |  |
MOSFETS Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property and equipment |  |  |  |  |  |  |  |  | 45,500 |  |  |  |  |
Global Cost Reduction Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, current | 2,330 |  |  |  |  |  |  |  | 2,330 |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 8,069 | 9,918 | $ 13,753 |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 8,069 | 9,918 | 13,753 |  |
Cash paid |  |  |  |  |  |  |  |  | (3,903) | (7,168) | (16,237) | (986) |  |
Foreign currency translation |  |  |  |  |  |  |  |  | (117) | 500 | (34) | (150) |  |
Balance at end of period | 3,645 |  |  |  | 7,665 |  |  |  | 3,645 | 7,665 | 6,264 | 12,617 |  |
Other Exit Costs |  |  |  |  |  |  |  |  |  | 577 |  |  |  |
Global Cost Reduction Program [Member] | Diodes Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 428 | 788 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 428 | 788 |  |  |
Global Cost Reduction Program [Member] | Optoelectronic Components Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 437 | 936 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 437 | 936 |  |  |
Global Cost Reduction Program [Member] | Resistors And Inductors Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 4,981 | 5,173 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 4,981 | 5,173 |  |  |
Global Cost Reduction Program [Member] | Capacitors Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 434 | 687 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 434 | 687 |  |  |
Global Cost Reduction Program [Member] | Unallocated Selling, General, and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 1,789 | 2,334 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 1,789 | 2,334 |  |  |
MOSFETs Enhanced Competitiveness Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, current | 208 |  |  |  |  |  |  |  | 208 |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 3,204 | 9,744 | 5,367 | $ 6,025 | $ 2,328
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 3,204 | 9,744 | 5,367 | 6,025 | 2,328
Cash paid |  |  |  |  |  |  |  |  | (2,055) | (7,173) | (15,686) | (426) | (856) | (267)
Foreign currency translation |  |  |  |  |  |  |  |  |  |  | 2 | 1 |  |
Balance at end of period | $ 208 |  |  |  | $ 2,263 |  |  |  | $ 208 | 2,263 | 6,232 | $ 12,172 | 7,230 | $ 2,061
Term of restructuring program |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Other Exit Costs |  |  |  |  |  |  |  |  |  | 958 | 5,763 |  |  |
Modules Product Transfer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | 0 | (463) |  | 2,080 |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related expenses |  |  |  |  |  |  |  |  |  | $ 0 | $ (463) |  | $ 2,080 |

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