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Leases (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Leases (Textual) [Abstract]      
Rental payments under the terms of operating lease $ 2,634 $ 2,583 $ 2,532
Percentage of increase under lease agreement 2.00%    
Total rent expense under operating lease agreements $ 13,188 $ 12,485 $ 10,714