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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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