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Consolidated Statements of Comprehensive Income (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net Income $ 12,384,260 $ 5,763,734
Other comprehensive income (loss):    
Foreign currency translation adjustments 518,164 729,020
Total other comprehensive income, net of tax 518,164 729,020
Comprehensive income $ 12,902,424 $ 6,492,754