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Income Taxes (Reconcilation of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate | $ 7,138 | $ 7,197 | $ 3,362
State income taxes, net of U.S. federal tax benefit | 89 | 93 | (15)
Effect of foreign operations | 611 | (1,137) | (1,418)
Change in valuation allowance | 498 | (397) | 1,266
Change in unrecognized tax benefits, net | 258 | 105 | (899)
Impairment of goodwill | 525 | 0 | 0
Specialty tax credits | (295) | (139) | (78)
Statutory rate changes | 272 | (470) | (180)
Effect of foreign exchange | 321 | (1,292) | 88
Prior period deferred tax adjustments | 0 | 0 | 817
Effects of U.S. tax reform | (135) | 11,311 | 0
Change in valuation allowance | 945 | (9,093) | 0
Other | 117 | (9) | 256
Total income tax expense | $ 10,344 | $ 6,169 | $ 3,199

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