Income Taxes - Expense for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current Federal	$ 0	$ 0	$ 1,402
Current State	0	0	0
Deferred Federal	35,806	(1,777)	0
Deferred State	6,310	(50)	0
Income tax (expense) benefit	$ 42,116	$ (1,827)	$ 1,402