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Commitments (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Rent expenses under operating leases      
Rent expenses $ 4,800,000 $ 6,800,000 $ 6,200,000
Future minimum lease payments under operating leases      
2012 4,197,000    
2013 3,396,000    
2014 3,010,000    
2015 2,924,000    
2016 2,759,000    
Thereafter 6,725,000    
Total $ 23,011,000