Income Taxes Provision for Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal	$ 60,837	$ 39,576	$ 40,127
State	7,164	8,947	4,060
Total current provision	68,001	48,523	44,187
Federal	(9,855)	16,037	(520)
State	(2,216)	(1,202)	290
Total deferred (benefit) provision	(12,071)	14,835	(230)
Total provision	$ 55,930	$ 63,358	$ 43,957