Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Commitments for minimum lease payments under non-cancelable leases as of December 31, 2011 were as follows:

2012	$	3,426
2013	2,746
2014	1,998
2015	1,647
2016	1,532
Thereafter	4,995
	$	16,344

Schedule of Rent Expense [Table Text Block]

Rent expense under cancelable and non-cancelable operating leases for 2011, 2010 and 2009 was as follows:

	Year ended December 31,
	2011		2010		2009
Building rent expense	$	3,556	$	3,102	$	3,056