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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Apr. 02, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | $ 142,742 |  | $ 142,742 | $ 141,407 |  |
Exchange rate effects |  |  |  | (557) | 1,335 |  |
Balance at end of period |  |  |  | 147,480 | 142,742 | $ 141,407 |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 168,232 | 245,454 |  |
Accumulated amortization |  |  |  | (102,544) | (175,700) |  |
Net Intangible Assets Subject to Amortization |  |  |  | 65,688 | 69,754 |  |
Intangible assets, net |  |  |  | 65,688 | 69,754 |  |
Amortization expense (excluding capitalized software) |  |  |  | 11,807 | 14,263 | 14,842 |
Finite Lived Intangible Assets Future Amortization Expense [Abstract] |  |  |  |  |  |  |
2019 |  |  |  | 8,424 |  |  |
2020 |  |  |  | 7,433 |  |  |
2021 |  |  |  | 6,543 |  |  |
2022 |  |  |  | 5,891 |  |  |
2023 |  |  |  | 5,668 |  |  |
Sonntag [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill acquired during period |  |  | $ 3,485 |  |  |  |
Capella Microsystems (Taiwan) Inc. [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  | $ 1,559
UltraSource [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill acquired during period |  | 4,227 |  | 4,227 |  |  |
Other intangible assets related to acquisitions |  | 6,500 |  |  |  |  |
EuroPower [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill acquired during period | $ 1,068 |  |  | 1,068 |  |  |
Resistors And Inductors Segment [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | 45,893 |  | 45,893 | 44,558 |  |
Exchange rate effects |  |  |  | (557) | 1,335 |  |
Balance at end of period |  |  |  | 50,631 | 45,893 | 44,558 |
Resistors And Inductors Segment [Member] | UltraSource [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill acquired during period |  |  |  | 4,227 |  |  |
Resistors And Inductors Segment [Member] | EuroPower [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill acquired during period |  |  |  | 1,068 |  |  |
Optoelectronic Components Segment [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | $ 96,849 |  | 96,849 | 96,849 |  |
Exchange rate effects |  |  |  | 0 | 0 |  |
Balance at end of period |  |  |  | 96,849 | 96,849 | $ 96,849 |
Optoelectronic Components Segment [Member] | UltraSource [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill acquired during period |  |  |  | 0 |  |  |
Optoelectronic Components Segment [Member] | EuroPower [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill acquired during period |  |  |  | 0 |  |  |
Patents and Acquired Technology [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 32,854 | 71,596 |  |
Accumulated amortization |  |  |  | (26,469) | (63,868) |  |
Capitalized Software [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 53,218 | 54,325 |  |
Accumulated amortization |  |  |  | (49,288) | (50,246) |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 59,119 | 63,655 |  |
Accumulated amortization |  |  |  | (19,958) | (26,622) |  |
Tradenames [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 23,041 | 55,272 |  |
Accumulated amortization |  |  |  | (6,829) | (34,378) |  |
Non-competition Agreements [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 0 | 606 |  |
Accumulated amortization |  |  |  | $ 0 | $ (586) |  |

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