Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax provision:
Federal	$ 52,557	$ 86,623	$ 58,558
State	(1,576)	9,866	15,154
Foreign	26,918	16,144	7,003
Total current	77,899	112,633	80,715
Deferred tax provision:
Federal	(37,669)	(10,994)	(18,930)
State	(17,635)	(17,794)	(2,751)
Foreign	(3,351)	(1,275)	(363)
Total deferred	(58,655)	(30,063)	(22,044)
Provision for income taxes	$ 19,244	$ 82,570	$ 58,671