Income Taxes - Income Tax Expense (Benefit) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Tax expense (benefit) at the statutory federal rate	$ 1,415	$ (180)	$ 996	$ 186,428
State income tax expense (benefit) (net of federal benefit)	142	(18)	100	18,643
Decrease in valuation allowance	(87)	81	(245)	(90,083)
Costs for the SEC investigation	(256)	0	1,092	0
Other	30	(269)	91	221
Income tax expense (benefit)	$ 1,244	$ (386)	$ 2,034	$ 115,209