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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) on operations | $ 920 | $ 1,814 | $ (6,721) | $ 1,213 | $ (4,249) | $ 1,450 | $ 9,066 | $ 1,835 | $ (2,774) | $ 8,102 | $ 11,210 |
Unremitted earnings of foreign subsidiaries |  |  |  |  |  |  |  |  |  |  | 52,715 |
Total operating income (loss) | 5,673 | $ 9,827 | $ (26,823) | $ 3,659 | 1,073 | $ 9,323 | $ 49,186 | $ 11,699 | (7,664) | 71,281 | 67,004 |
General business tax credit carry forwards, expiration date |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2025
Liability for uncertain tax positions reduction to noncurrent asset | 3,449 |  |  |  |  |  |  |  | 3,449 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 3,449 |  |  |  | $ 3,449 |  |  |  | 3,449 | 3,449 |  |
Amount affecting the Company's tax rate |  |  |  |  |  |  |  |  | (2,252) | 14,363 | 13,662 |
Gross interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | 0 | (5) | (13) |
Impairment of Goodwill |  |  |  |  |  |  |  |  | 0 | $ 0 | 0 |
Deferred tax liability related to earnings that are not considered indefinitely reinvested |  |  |  |  |  |  |  |  |  |  | $ 13,750 |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 74,474 |  |  |  |  |  |  |  | 74,474 |  |  |
General business and foreign tax credit carry forwards | 1,792 |  |  |  |  |  |  |  | 1,792 |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 30,991 |  |  |  |  |  |  |  | 30,991 |  |  |
General business and foreign tax credit carry forwards | 1,348 |  |  |  |  |  |  |  | 1,348 |  |  |
U.S. Federal [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  | (15,801) |  |  |
General business and foreign tax credit carry forwards | $ 19,810 |  |  |  |  |  |  |  | $ 19,810 |  |  |
Maximum [Member] | State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carry forwards, expiration dates |  |  |  |  |  |  |  |  | Dec. 31, 2040 |  |  |
Maximum [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carry forwards, expiration dates |  |  |  |  |  |  |  |  | Dec. 31, 2025 |  |  |
Minimum [Member] | State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carry forwards, expiration dates |  |  |  |  |  |  |  |  | Dec. 31, 2024 |  |  |
Minimum [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carry forwards, expiration dates |  |  |  |  |  |  |  |  | Dec. 31, 2021 |  |  |

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