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Condensed Consolidated Statements Of Comprehensive Income (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statement Of Comprehensive Income [Abstract]        
Comprehensive Income $ 34,207,751 $ 35,965,412 $ 89,681,305 $ 83,278,217