Earnings per Share

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Earnings Per Share

Earnings per Share

Net earnings are divided by the weighted average number of shares outstanding during the period to calculate basic earnings per share. Diluted earnings per share are calculated to give effect to stock options and other stock-based awards. The calculation of diluted earnings per share included 359,421 and 136,988 restricted shares for the three months ended March 31, 2013 and 2012, respectively. The calculation of diluted earnings per share also included options to purchase 196,323 and 298,644 shares of common stock for the three months ended March 31, 2013 and 2012, respectively.