Income Taxes - Components of Income Tax Expense (Benefit) by Jurisdiction and by Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. Federal (a)
Current	$ (780)	$ 35	$ 3
Deferred	(3,986)	(1,093)	(3,768)
Total	(4,766)	(1,058)	(3,765)
State and local
Current	550	511	(60)
Deferred	(180)	1,519	883
Total	370	2,030	823
Foreign
Current	(145)	284	423
Deferred	0	325	0
Total	(145)	609	423
Total Income Taxes
Current	(375)	830	366
Deferred	(4,166)	751	(2,885)
Total	$ (4,541)	$ 1,581	$ (2,519)