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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 03, 2019 | Jun. 11, 2018 | Feb. 08, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 147,480 | $ 142,742 |
Exchange rate effects |  |  |  | (162) | (557) |
Balance at end of period |  |  |  | 150,642 | 147,480 | $ 142,742
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 169,100 | 168,232 |
Accumulated amortization |  |  |  | (108,441) | (102,544) |
Net Intangible Assets Subject to Amortization |  |  |  | 60,659 | 65,688 |
Intangible assets, net |  |  |  | 60,659 | 65,688 |
Amortization expense (excluding capitalized software) |  |  |  | 8,476 | 11,807 | 14,263
Finite Lived Intangible Assets Future Amortization Expense [Abstract] |  |  |  |  |  |
2020 |  |  |  | 7,886 |  |
2021 |  |  |  | 6,688 |  |
2022 |  |  |  | 6,044 |  |
2023 |  |  |  | 5,824 |  |
2024 |  |  |  | 5,507 |  |
UltraSource [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  | $ 4,227 |  | 4,227 |
EuroPower [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  | $ 1,068 |  |  | 1,068 |
Bi-Metallix [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period | $ 3,324 |  |  | 3,324 |  |
Optoelectronic Components [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 [Member] | UltraSource [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  |  | 0 |
Optoelectronic Components [Member] | EuroPower [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  |  | 0 |
Optoelectronic Components [Member] | Bi-Metallix [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  | 0 |  |
Resistors [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 24,816 | 20,078 |
Exchange rate effects |  |  |  | (162) | (557) |
Balance at end of period |  |  |  | 27,978 | 24,816 | 20,078
Resistors [Member] | UltraSource [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  |  | 4,227 |
Resistors [Member] | EuroPower [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  |  | 1,068 |
Resistors [Member] | Bi-Metallix [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  | 3,324 |  |
Inductors [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 25,815 | 25,815 |
Exchange rate effects |  |  |  | 0 | 0 |
Balance at end of period |  |  |  | 25,815 | 25,815 | $ 25,815
Inductors [Member] | UltraSource [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  |  | 0 |
Inductors [Member] | EuroPower [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill acquired during period |  |  |  |  | 0 |
Inductors [Member] | Bi-Metallix [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 |  |  |  | 31,125 | 32,854 |
Accumulated amortization |  |  |  | (24,905) | (26,469) |
Capitalized Software [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 55,862 | 53,218 |
Accumulated amortization |  |  |  | (50,976) | (49,288) |
Customer Relationships [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 59,603 | 59,119 |
Accumulated amortization |  |  |  | (23,871) | (19,958) |
Tradenames [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible Assets Subject to Amortization |  |  |  | 22,510 | 23,041 |
Accumulated amortization |  |  |  | $ (8,689) | $ (6,829) |

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