Income Taxes - Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal									$ 0	$ 1,076	$ (10,754)
State									(1,188)	(2,496)	(1,167)
Foreign									(1,343)	(518)	0
Current income tax (expense) benefit									(2,531)	(1,938)	(11,921)
Deferred:
Federal									90,457	25,578	22,641
State									11,225	5,492	(2,040)
Foreign									0	0	0
Deferred income tax (expense) benefit									101,682	31,070	20,601
Income tax benefit	$ 91,892	$ 7,671	$ (2,384)	$ 1,972	$ 37,938	$ 1,547	$ (2,832)	$ (7,521)	$ 99,151	$ 29,132	$ 8,680