Stock Based Compensation Plans
9 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation Plans
Stock-Based Compensation Plans

Using the Black-Scholes-Merton option valuation model and the assumptions listed below, the Company recorded $600,710 and $2,139,513 in compensation expense with corresponding tax benefits of $234,277 and $834,410 for the three and nine month periods ended September 30, 2012, respectively. For the three and nine month periods ended September 30, 2011, the Company recorded $294,812 and $798,860 in compensation expense with corresponding tax benefits of $114,977 and $311,555, respectively. During the nine month period ended September 30, 2012, the Company did not grant any stock options. For the nine month period ended September 30, 2011, the Company granted options to purchase 186,306 shares of our common stock to various employees and directors. The Company also granted 454,487 and 192,750 shares of restricted stock during the nine month periods ended September 30, 2012 and September 30, 2011, respectively, to various employees.

The following assumptions were utilized in the valuation for options granted during the nine months ended September 30, 2011. There were no options granted during the nine month period September 30, 2012.
 
Nine Months Ended September 30,
 
2011
Dividend yield

Risk-free interest rate
1.95%-3.37%

Weighted-average expected life
7.3 years

Volatility
35.0%-35.2%