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Commitments and Contingencies (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
investments
Dec. 31, 2011
Dec. 31, 2010
Operating lease expense      
Total operating lease expense $ 6,500,000 $ 7,200,000 $ 7,300,000
Future minimum lease obligations under non-cancelable operating leases      
2013 5,479,000    
2014 4,835,000    
2015 4,469,000    
2016 4,582,000    
2017 4,210,000    
Thereafter 9,265,000    
Letters of credit issued      
Letters of credit issued 12,600,000    
Number of investments related to which letters of credit have been issued 5    
Legal settlement payment $ 2,000,000