Income Taxes (Provision/Benefit for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 15,324	$ 14,362	$ 12,630
State	2,227	1,086	2,394
Foreign	686	1,120	802
Deferred:
Federal	(2,568)	(1,323)	(2,174)
State	(353)	208	(228)
Foreign	(102)	(219)	(32)
Provision for income taxes	$ 15,214	$ 15,234	$ 13,392