Income Taxes - Components of Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 6,481	$ 5,967	$ 6,200
State and local	523	577	1,587
Foreign	4,664	6,597	6,138
Provision for income taxes, current	11,668	13,141	13,925
Deferred
Federal	(1,795)	5,471	7,506
State and local	435	563	488
Foreign	(4,032)	748	1,219
Provision for income taxes, deferred	(5,392)	6,782	9,213
Provision for income taxes	$ 6,276	$ 19,923	$ 23,138