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Commitments and Contingencies (Details Textual) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Commitments and Contingencies (Textual) [Abstract]      
Total rent expense and related taxes and operating expenses under operating leases $ 3,870 $ 3,249  
Tax reserves, non-income tax related $ 55   $ 49