Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 2,683,936 $ 2,690,196 $ 5,292,453 $ 8,341,730
Effective tax rate 28.40% 17.90% 28.20% 24.00%
Net tax benefit relating to accrued interest on tax positions that were resolved during the period   936,389    
Net tax benefit included in income tax rate relating to an increase in the reserve for uncertain tax positions during the period 1,820,848      
Interest included in net tax expense relating to an increase in the reserve for uncertain tax positions during the period $ 49,060