Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 9,189	$ (31,111)	$ 11,319
Foreign	378	230	217
State	3,794	4,618	3,081
Current tax expense (benefit)	13,361	(26,263)	14,617
Deferred:
Federal	11,528	38,297	(5,659)
Foreign	(24)	0	0
State	320	2,951	(1,344)
Revaluation due to state legislative changes	3,130	2,594	323
Deferred tax benefit (expense)	14,954	43,842	(6,680)
Income Tax Benefit	$ 28,315	$ 17,579	$ 7,937