Income Taxes (Components of Provision for Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current tax provision:
Federal		$ 58,558	$ 34,387	$ 123,406
State		15,154	7,850	28,657
Foreign		7,003	1,162	(70)
Total current		80,715	43,399	151,993
Deferred tax provision:
Federal		(18,930)	(26,903)	(14,008)
State		(2,751)	(3,168)	(4,589)
Foreign		(363)	0	0
Total deferred		(22,044)	(30,071)	(18,597)
Provision for income taxes	$ 21,616	$ 58,671	$ 13,328	$ 133,396