Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States federal income taxes:
Current	$ 0	$ (31)	$ 27
Deferred	(561)	(11,855)	(523)
Foreign income taxes:
Current	34	68	(4)
Deferred	(230)	635	2,308
State income taxes:
Current	0	113	0
Deferred	(173)	(4,355)	264
Total income tax expense (benefit) from continuing operations	$ (930)	$ (15,425)	$ 2,072