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Income Taxes (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2012
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Sep. 30, 2011
|
Sep. 30, 2012
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Sep. 30, 2011
|
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| Income Tax Disclosure [Abstract] | ||||
| Income before provision for income taxes | $ 6,198,330 | $ 5,370,565 | $ 16,867,740 | $ 13,519,806 |
| Income tax expense | $ (2,381,394) | $ (1,991,064) | $ (6,336,180) | $ (5,003,592) |
| Effective tax rate | 38.40% | 37.10% | 37.60% | 37.00% |