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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
Income tax expense | $ 791 | $ (3,913) | $ 1,784 | $ (2,054) |
Pre-tax income | $ 2,586 | 4,039 | $ 4,999 | $ 10,867 |
Effective tax rate |  |  | 35.70% | (18.90%) | 35.00%
Percentace of increase to effective income tax rate |  |  | 12.00% |  |
Provisional expense for the GILTI Tax |  |  | $ 100 |  |
Blended tax rate |  |  | 24.66% |  |
State income tax |  |  | 3.66% |  |
U.S. Federal income tax statutory rate |  |  | 21.00% |  |
Canada [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Effective tax rate |  |  | 27.00% |  |
U.S. Deferred Tax Assets [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Valuation allowance |  | $ 5,100 |  | $ 5,100 |
Tax Act [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax expense |  |  | $ 300 |  |
U.S. Federal income tax statutory rate |  |  | 21.00% |  |

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