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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
Provisional one-time transition tax, 2017 Tax Act |  |  |  |  | $ 2,200
Income tax benefit related to net operating loss |  |  |  |  | 3,900
Provisional deferred tax liability, undistributed foreign earnings, 2017 Tax Act |  |  | $ 1,500 |  | 1,800
Provisional undistributed accumulated earnings of foreign subsidiary, 2017 Tax Act |  |  | 14,100 |  | 25,500
Income tax expense, 2017 Tax Act |  | $ 800 |  |  |
Global intangible low-taxed income recognized |  |  | 12,900 | $ 15,600 |
Deferred tax liabilities, gross |  | 2,867 | 7,880 | 2,867 |
Valuation allowance adjustment |  |  | (600) |  |
Valuation allowance |  | 14,455 | 14,867 | 14,455 |
Undistributed earnings of foreign subsidiaries |  | 143,000 | 159,000 | 143,000 |
Unremitted earnings withholding taxes |  |  | 1,500 |  |
Additional unremitted earnings withholding taxes |  |  | 17,500 |  |
Net income taxes paid |  |  | 11,100 | 7,300 | 4,100
Unrecognized tax benefits, income tax penalties and interest accrued |  | 100 | 0 | 100 | 100
Penalties and interest accrued |  | 100 | 100 | 100 | 100
Unrecognized tax benefits that would impact effective tax rate |  | 900 | 1,400 | 900 | $ 800
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Expected change in unrecognized tax benefits statute lapse |  |  | 100 |  |
State and Local Jurisdiction |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Valuation allowance |  | 1,000 | $ 800 | 1,000 |
State and Local Jurisdiction | Minimum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Statutes of limitations range |  |  | 3 years |  |
State and Local Jurisdiction | Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Statutes of limitations range |  |  | 4 years |  |
Foreign Tax Authority | Minimum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase in unrecognized tax benefits is reasonably possible |  |  | $ 100 |  |
Statutes of limitations range |  |  | 3 years |  |
Foreign Tax Authority | Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase in unrecognized tax benefits is reasonably possible |  |  | $ 200 |  |
Statutes of limitations range |  |  | 10 years |  |
United States |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Valuation allowance |  | 12,300 | $ 11,800 | 12,300 |
United States | State and Local Jurisdiction |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Valuation allowance |  | 8,057 | 8,411 | 8,057 |
Net Operating and Capital Loss Carryforward |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Valuation allowance |  | $ 2,200 | $ 3,100 | $ 2,200 |
Dynamic Systems Inc. |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred tax liabilities, gross | $ 17,000 |  |  |  |
Deferred tax liabilities, intangible assets | 4,100 |  |  |  |
Valuation allowance adjustment | $ (2,500) |  |  |  |

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