Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax benefit at U.S. statutory rate	$ 56,742	$ 121,320	$ 205,777
State taxes, net of federal income tax	10,423	21,576	24,891
Uncertain tax positions	(60,376)	5,713	(246,037)
Goodwill impairment	0	(88,265)	(78,515)
Impact of the Tax Act	0	(6,042)	114,716
Stock compensation	(2,639)	(4,717)	(4,093)
Tax credits	(106)	688	1,908
Meals and entertainment	(416)	(493)	(726)
Other	(1,359)	(324)	(1,406)
Total	$ 2,269	$ 49,456	$ 16,515