Income Taxes - Components of Income Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense (benefit):
Federal	$ 50,141	$ 13,497	$ 93,540
State	5,116	(619)	104
Total	55,257	12,878	93,644
Deferred income tax expense (benefit):
Federal	(1,879)	14,489	(12,219)
State	12,823	11,820	8,142
Total	10,944	26,309	(4,077)
Total income tax expense	$ 66,201	$ 39,187	$ 89,567