Income Taxes - Provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current tax expense:
U.S. federal	$ (891)	$ 1,319	$ 3,814
State and local	(75)	12	391
Foreign	6,464	5,122	3,483
Total current	5,498	6,453	7,688
Deferred tax (benefit) expense:
U.S. federal	(882)	153	(40)
State and local	3,630	(409)	(294)
Foreign	(161)	(912)	(577)
Total deferred	2,587	(1,168)	(911)
Total provision for income taxes	$ 8,085	$ 5,285	$ 6,777