Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Domestic	$ 13,293	$ 13,495	$ 10,605
Foreign	4,614	3,382	3,200
State	2,947	2,685	2,366
Provision for current income tax expense (benefit)	20,854	19,562	16,171
Deferred:
Domestic	3,481	(600)	(1,074)
Foreign	(718)	540	249
State	41	(48)	(52)
Provision for deferred income tax expense (benefit)	2,804	(108)	(877)
Total income taxes	$ 23,658	$ 19,454	$ 15,294