Income Taxes - Income Tax Provision Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ (1,100)	$ 0	$ 0
State	292	0	0
Total current expense	(808)	0	0
Deferred
Federal	1,995	4,784	47,677
State	8,135	7,569	8,586
Total deferred provision	10,130	12,353	56,263
Total	$ 9,322	$ 12,353	$ 56,263