Income Taxes (Reconciliation of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 5,553	$ 7,138	$ 7,197
State income taxes, net of U.S. federal tax benefit	(21)	89	93
Effect of foreign operations	(109)	611	(1,137)
Change in valuation allowance	(646)	498	(397)
Change in unrecognized tax benefits, net	650	258	105
Impairment of goodwill	0	525	0
Specialty tax credits	(176)	(295)	(139)
Statutory rate changes	(249)	272	(470)
Effect of foreign exchange	(1,152)	321	(1,292)
Loss of benefit of U.S. net operating loss	967	0	0
Excess tax benefits related to share based compensation	(357)	0	0
Effects of U.S. tax reform	0	(135)	11,311
Change in valuation allowance	0	945	(9,093)
Other	(315)	117	(9)
Total income tax expense	$ 4,145	$ 10,344	$ 6,169