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Commitments and Contingencies (Details) (USD $)
Dec. 31, 2012
Future minimum payments to third parties for the next five years and thereafter  
2013 $ 6,896,238
2014 2,428,301
2015 2,255,899
2016 1,910,004
2017 1,522,302
Thereafter 7,989,168
Total $ 23,001,912