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Condensed Consolidated Statements Of Comprehensive Income (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Statement Of Comprehensive Income [Abstract]        
Comprehensive Income $ 44,881,550 $ 26,328,790 $ 134,562,855 $ 109,607,007