Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 0	$ 0
State	0	(15)
Total current	0	(15)
Deferred:
Federal	(1,398)	16,186
State	(1,072)	202
Total deferred	(2,470)	16,388
Total income tax (expense) benefit	$ (2,470)	$ 16,373