Income Taxes - Provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense:
U.S. federal	$ 47	$ 971	$ (891)
State and local	49	254	(75)
Foreign	8,127	6,426	6,464
Total current	8,223	7,651	5,498
Deferred tax (benefit) expense:
U.S. federal	(687)	(101)	(882)
State and local	74	(67)	3,630
Foreign	307	(1,410)	(161)
Total deferred	(306)	(1,578)	2,587
Total provision for income taxes	$ 7,917	$ 6,073	$ 8,085