Income Taxes - Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax benefit (expense)
State	$ (12)	$ (118)	$ (45)
Foreign	(33)	(292)	421
Current income tax benefit (expense)	(45)	(410)	376
Deferred income tax benefit (expense)
Federal	(8,302)	(12,878)	22,619
State	1,838	(2,851)	10,282
Foreign	1,494	2,914	2,674
Change in enacted tax rates	0	0	(123,289)
Net operating loss carryforwards created	68,344	26,058	17,466
Deferred income tax benefit (expense)	63,374	13,243	(70,248)
Income tax benefit (expense) before valuation allowances	63,329	12,833	(69,872)
Deferred tax valuation allowances	(62,759)	(18,704)	100,362
Income tax benefit (expense)	$ 570	$ (5,871)	$ 30,490