Income Taxes - Benefits (Provision) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 0	$ 2,398	$ 0
State	6,318	(1,737)	(2,931)
Foreign	(2,738)	(3,424)	(2,438)
Current income tax benefit, total	3,580	(2,763)	(5,369)
Deferred
Federal	2,045	(10,759)	25,739
State	5,673	(2,738)	10,657
Foreign	27,428	(2,595)	25,088
Income tax benefit, total	35,146	(16,092)	61,484
Total, net	$ 38,726	$ (18,855)	$ 56,115