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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Jan. 03, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  | $ 150,642 | $ 147,480 |
Exchange rate effects |  |  | 993 | (162) |
Balance at end of period |  |  | 158,183 | 150,642 | $ 147,480
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets Subject to Amortization |  |  | 174,237 | 169,100 |
Accumulated amortization |  |  | (107,442) | (108,441) |
Net Intangible Assets Subject to Amortization |  |  | 66,795 | 60,659 |
Intangible assets, net |  |  | 66,795 | 60,659 |
Amortization expense (excluding capitalized software) |  |  | 8,113 | 8,476 | 11,807
Finite Lived Intangible Assets Future Amortization Expense [Abstract] |  |  |  |  |
2021 |  |  | 7,920 |  |
2022 |  |  | 7,227 |  |
2023 |  |  | 6,992 |  |
2024 |  |  | 6,652 |  |
2025 |  |  | 6,384 |  |
Bi-Metallix [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired during period |  | $ 3,324 |  | 3,324 |
Applied Thin-Film Products [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired during period | $ 6,548 |  | 6,548 |  |
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] | Bi-Metallix [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired during period |  |  |  | 0 |
Optoelectronic Components [Member] | Applied Thin-Film Products [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired during period |  |  | 0 |  |
Resistors [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  | 27,978 | 24,816 |
Exchange rate effects |  |  | 993 | (162) |
Balance at end of period |  |  | 35,519 | 27,978 | 24,816
Resistors [Member] | Bi-Metallix [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired during period |  |  |  | 3,324 |
Resistors [Member] | Applied Thin-Film Products [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired during period |  |  | 6,548 |  |
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] | Bi-Metallix [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired during period |  |  |  | 0 |
Inductors [Member] | Applied Thin-Film Products [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 |  |  | 21,259 | 31,125 |
Accumulated amortization |  |  | (14,340) | (24,905) |
Capitalized Software [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets Subject to Amortization |  |  | 58,419 | 55,862 |
Accumulated amortization |  |  | (52,990) | (50,976) |
Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets Subject to Amortization |  |  | 71,454 | 59,603 |
Accumulated amortization |  |  | (28,659) | (23,871) |
Tradenames [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets Subject to Amortization |  |  | 23,105 | 22,510 |
Accumulated amortization |  |  | $ (11,453) | $ (8,689) |

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