Income Taxes - Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax benefit (expense)
Federal	$ 0	$ 0	$ 2,432
State	0	0	2,492
Foreign	(225)	0	0
Current income tax (expense) benefit	(225)	0	4,924
Deferred income tax benefit (expense)
Federal	24,151	(14,112)	15,297
State	9,736	1,420	3,736
Foreign	1,035	9	0
Net operating loss carryforwards created	88,110	61,640	48,024
Deferred income tax (expense) benefit	123,032	48,957	67,057
Income tax benefit (expense) before valuation allowances	122,807	48,957	71,981
Deferred tax valuation allowances	(114,106)	(52,529)	(76,916)
Income tax benefit (expense)	$ 8,701	$ (3,572)	$ (4,935)