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Stock Based Compensation Plans (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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| Stock based compensation plans: | ||||
| Stock-based compensation expense | $ 600,710 | $ 294,812 | $ 2,139,513 | $ 798,860 |
| Tax benefits from stock-based compensation expense | $ 234,277 | $ 114,977 | $ 834,410 | $ 311,555 |
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Stock options
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| Stock based compensation plans: | ||||
| Grants in period, options | 0 | 186,306 | ||
| Assumptions utilized in the valuation for options granted: | ||||
| Dividend yield | 0.00% | |||
| Risk-free interest rate, minimum | 1.95% | |||
| Risk-free interest rate, maximum | 3.37% | |||
| Weighted-average expected life | 7 years 3 months 18 days | |||
| Volatility, minimum | 35.00% | |||
| Volatility, maximum | 35.20% | |||
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Restricted stock
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| Stock based compensation plans: | ||||
| Grants in period, other than options | 454,487 | 192,750 | ||