Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income before income taxes:
Domestic	$ 27,827	$ 21,976	$ 17,452
Foreign	7,975	6,415	3,400
Total income before income taxes	35,802	28,391	20,852
Current:
Federal	7,846	6,869	4,746
State and local	1,653	1,750	1,111
Foreign	2,899	1,765	1,328
Total current	12,398	10,384	7,185
Deferred:
Federal	856	310	910
State and local	236	48	133
Foreign	(376)	(211)	(108)
Total deferred	716	147	935
Total income tax expense	$ 13,114	$ 10,531	$ 8,120