Income Taxes (Components of the Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 58,109	$ 27,860	$ 22,377
Foreign	52,380	43,796	30,878
State	11,267	10,238	7,710
Total current	121,756	81,894	60,965
Deferred:
Federal	(26,886)	(75,479)	(26,922)
Foreign	(3,621)	(2,746)	(1,023)
State	(10,597)	(11,153)	(9,037)
Total deferred	(41,104)	(89,378)	(36,982)
Total provision	$ 80,652	$ (7,484)	$ 23,983