Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 1,488	$ 9,189	$ (31,111)
Foreign	150	378	230
State	(364)	3,794	4,618
Current tax expense (benefit)	1,274	13,361	(26,263)
Deferred:
Federal	38,028	11,528	38,297
Foreign	(6)	(24)	0
State	4,278	320	2,951
Revaluation due to state legislative changes	(528)	3,130	2,594
Deferred tax benefit (expense)	41,772	14,954	43,842
Income Tax Benefit	$ 43,046	$ 28,315	$ 17,579