Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 120,030	$ 83,905	$ 54,132
State	20,099	13,949	8,948
Foreign	2,164	659	544
Total current	142,293	98,513	63,624
Deferred
Federal	(37,713)	37,259	11,228
State	(9,059)	(415)	(2,428)
Foreign	(1,055)	182	641
Total deferred	(47,827)	37,026	9,441
Other non-current
Federal	7,797	573	7,605
State	1,907	114	1,621
Foreign	173	3	(417)
Total other	9,877	690	8,809
Total income tax expense	$ 104,343	$ 136,229	$ 81,874