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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | $ 141,407 | $ 138,244 |
Goodwill impairment loss | 0 | 0 | $ (5,380)
Exchange rate effects | 1,335 | (322) |
Balance at end of period | 142,742 | 141,407 | 138,244
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets Subject to Amortization | 245,454 | 287,053 |
Accumulated amortization | (175,700) | (202,590) |
Net Intangible Assets Subject to Amortization | 69,754 | 84,463 |
Intangible assets, net | 69,754 | 84,463 |
Amortization expense (excluding capitalized software) | 14,263 | 14,842 | 21,829
Finite Lived Intangible Assets Future Amortization Expense [Abstract] |  |  |
2018 | 11,620 |  |
2019 | 7,741 |  |
2020 | 6,750 |  |
2021 | 5,863 |  |
2022 | 5,192 |  |
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 |  |  | 57,600
Resistors And Inductors Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 44,558 | 41,395 |
Exchange rate effects | 1,335 | (322) |
Balance at end of period | 45,893 | 44,558 | 41,395
Resistors And Inductors Segment [Member] | Sonntag [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired during period |  | 3,485 |
Optoelectronic Components Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of period | 96,849 | 96,849 |
Exchange rate effects | 0 | 0 |
Balance at end of period | 96,849 | 96,849 | $ 96,849
Optoelectronic Components Segment [Member] | Sonntag [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 | 71,596 | 93,395 |
Accumulated amortization | (63,868) | (81,807) |
Capitalized Software [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets Subject to Amortization | 54,325 | 53,807 |
Accumulated amortization | (50,246) | (49,388) |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets Subject to Amortization | 63,655 | 84,905 |
Accumulated amortization | (26,622) | (42,787) |
Tradenames [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets Subject to Amortization | 55,272 | 53,680 |
Accumulated amortization | (34,378) | (27,460) |
Non-competition Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets Subject to Amortization | 606 | 1,266 |
Accumulated amortization | $ (586) | $ (1,148) |

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