Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011
Current income tax provision:
U.S. federal									$ 2,530	$ 2,486
U.S. state and local									465	463
Non-U.S.									229	162
Total current tax provision									3,224	3,111
Deferred income tax provision (benefit):
U.S. federal									(396)	627
U.S state and local									(40)	(62)
Non-U.S									64	113
Total deferred tax provision (benefit)									(427)	(108)
Income tax provision	$ 472	$ 861	$ 972	$ 547	$ 1,316	$ 815	$ 1,007	$ 651	$ 2,852	$ 3,789