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Earnings Per Share | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Earnings Per Share | 8. Earnings Per Share Basic earnings per share is calculated by dividing income available to common shareholders by the weighted-average number of shares of common stock outstanding during each period. Diluted earnings per share (“diluted EPS”) is calculated using income available to common shareholders divided by diluted weighted-average shares of common stock outstanding during each period. Potentially dilutive securities include shares of common stock underlying stock options, SOSARs and non-vested stock awards (collectively “stock awards”). Diluted EPS considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect. Stock awards of 393, 360 and 240 were excluded from the calculation of 2013, 2012 and 2011 diluted EPS, respectively, because they were anti-dilutive. In addition, 381, 449 and 224 stock awards subject to performance conditions were excluded from the 2013, 2012 and 2011 calculations of diluted EPS. The following table sets forth the computations of basic and diluted earnings per share:
| Year ended December 31
| 2013 |  | 2012 |  | 2011
Net income | $ | 327,438 |  | $ | 278,000 |  | $ | 214,945
Shares: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  | 30,957 |  |  | 31,513 |  |  | 31,217
Dilutive stock awards |  | 324 |  |  | 270 |  |  | 558
Diluted weighted average number of common shares outstanding |  | 31,281 |  |  | 31,783 |  |  | 31,775
Basic earnings per share | $ | 10.58 |  | $ | 8.82 |  | $ | 6.89
Diluted earnings per share | $ | 10.47 |  | $ | 8.75 |  | $ | 6.76

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