Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current expense:
Federal	$ 43,850	$ 5,465	$ 45,074
State	13,039	(362)	11,174
Foreign	6,573	1,126	3,203
Total current	63,462	6,229	59,451
Deferred (benefit) expense:
Federal	(3,054)	19,583	9,992
State	(5,302)	2,735	10,059
Foreign	(1,813)
Total deferred	(10,169)	22,318	20,051
Total provision	$ 53,293	$ 28,547	$ 79,502