Income Taxes - Components of Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax benefit (expense)
Federal	$ (15,336)	$ (16,318)	$ (8,721)
State	(6,402)	(6,062)	(3,489)
Foreign	(1,349)	2,981	9,639
Total current	(23,087)	(19,399)	(2,571)
Deferred tax benefit (expense)
Federal	14,576	480,712	(4,701)
State	10,945	39,255	(3,279)
Foreign	1,159	(2,061)	(756)
Total deferred	26,680	517,906	(8,736)
Total income tax benefit (expense)	$ 3,593	$ 498,507	$ (11,307)