Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 137,993	$ 120,030	$ 83,905
State	19,051	20,099	13,949
Foreign	1,252	2,164	659
Total current	158,296	142,293	98,513
Deferred
Federal	(2,945)	(37,713)	37,259
State	463	(9,059)	(415)
Foreign	(225)	(1,055)	182
Total deferred	(2,707)	(47,827)	37,026
Other non-current
Federal	27,115	7,797	573
State	2,383	1,907	114
Foreign	19	173	3
Total other	29,517	9,877	690
Total income tax expense	$ 185,106	$ 104,343	$ 136,229