Income Taxes - Components of Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal		$ 139	$ (2,464)
Foreign	$ 1,937	6,952	2,325
State and local	(111)	(407)	55
Total current expense (benefit) for income taxes	1,826	6,684	(84)
Deferred:
Federal	1,459	2,104	(11,230)
Foreign	(646)	516	(291)
State and local	127	28	191
Total deferred expense (benefit) for income taxes	940	2,648	(11,330)
Total expense (benefit) for income taxes	$ 2,766	$ 9,332	$ (11,414)