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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income $ 26,133,088 $ 57,620,552 $ 47,083,424
Other comprehensive income      
Foreign currency translation gain 3,355,961 11,038,151 5,003,108
Total comprehensive income $ 29,489,049 $ 68,658,703 $ 52,086,532