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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) on operations | $ (4,249) | $ 1,450 | $ 9,066 | $ 1,835 | $ 690 | $ 3,467 | $ 3,820 | $ 3,233 | $ 8,102 | $ 11,210 | $ 7,533
Effective income tax rate |  |  |  |  |  |  |  |  | 11.80% | 17.20% | 14.30%
Unremitted earnings of foreign subsidiaries |  |  |  |  | 56,894 |  |  |  |  | $ 56,894 |
General business tax credit carry forwards, expiration date |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2025
Liability for uncertain tax positions reduction to noncurrent asset | 3,449 |  |  |  |  |  |  |  | $ 3,449 |  |
Liability for uncertain tax positions, noncurrent | 0 |  |  |  |  |  |  |  | 0 |  |
Unrecognized tax benefits that would impact effective tax rate | 3,449 |  |  |  | 3,481 |  |  |  | 3,449 | 3,481 |
Gross interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | (5) | (13) | $ (33)
Accrued payment of interest and penalties | 0 |  |  |  | $ 19 |  |  |  | 0 | 19 |
Impairment of Goodwill |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 0
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 57,817 |  |  |  |  |  |  |  | 57,817 |  |
General business and foreign tax credit carry forwards | 1,711 |  |  |  |  |  |  |  | 1,711 |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 23,851 |  |  |  |  |  |  |  | 23,851 |  |
General business and foreign tax credit carry forwards | 1,354 |  |  |  |  |  |  |  | 1,354 |  |
U.S. Federal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
General business and foreign tax credit carry forwards | $ 15,833 |  |  |  |  |  |  |  | $ 15,833 |  |

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