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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |
Income taxes (benefit) |  | $ 1,917 | $ 4,560 | $ 1,787
Pre-tax income |  | $ 5,923 | $ 12,451 | $ 15,600
Effective tax rate |  | 32.40% | 36.60% | 11.50%
Percentage of income tax expense attributable to Canada |  | 82.10% |  |
State income tax (net of federal benefit) |  | 0.90% | 2.40% | 0.20%
US Federal income tax statutory rate |  | 21.00% | 35.00% | 34.00%
Liability for uncertain tax positions taken on a foreign tax return |  | $ 800 |  |
Cash and cash equivalents held by foreign subsidiaries |  | 25,800 |  |
Penalties and interest related to unrecognized tax benefits |  | 100 | $ 100 |
Income tax net operating loss carryforwards |  | 13,000 |  |
Total deferred tax assets |  | 2,798 |  |
Unrecognized tax benefits that would impact effective tax rate |  | 800 |  |
Tax Act [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income taxes (benefit) |  | $ 400 |  |
Tax Act [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income taxes (benefit) | $ 5,400 |  | 300 |
Effective tax rate |  | 24.66% |  |
Tax expense for GILTI, net |  | $ 100 |  |
State income tax (net of federal benefit) |  | 3.66% |  |
US Federal income tax statutory rate |  | 21.00% |  |
Liability for uncertain tax positions taken on a foreign tax return | $ 5,100 | $ 400 | $ 5,100 |
Tax Act [Member] | FDII [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income taxes (benefit) |  | $ (100) |  |
Percentage of income tax rate deduction |  | 37.50% |  |
Tax Act [Member] | Deferred Tax Assets And Liabilities [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income taxes (benefit) |  | $ 100 |  |

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