Income Taxes - Income Tax Expense (Benefit) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Tax expense (benefit) at the statutory federal rate	$ 563	$ 8,154	$ (419)	$ 186,619
State income tax expense (benefit) (net of federal benefit)	56	816	(42)	18,662
Decrease in valuation allowance	(144)	(864)	(158)	(90,164)
Costs for the ongoing SEC investigation	1,348	0	1,348	0
Other	39	584	61	477
Income tax expense	$ 1,862	$ 8,690	$ 790	$ 115,594