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Goodwill (Tables)
6 Months Ended
Jun. 30, 2012
Goodwill
    June 30,     December 31,  
    2012     2011  
Gross carrying amount of goodwill   $ 20,016,727     $ 20,016,727  
Accumulated impairment loss on goodwill     (18,247,866 )     (16,176,866 )
Net goodwill   $ 1,768,861     $ 3,839,861