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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Rent expense      
Rent expense $ 2,932,104 $ 4,193,433 $ 3,326,862
Sublease income (411,885) (424,847) (622,910)
Rent expense, net $ 2,520,219 $ 3,768,586 $ 2,703,952