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Earnings Per Share | 12 Months Ended
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Dec. 31, 2014
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 232, 3 93 and 360 were excluded from the calculation of 201 4, 201 3 and 201 2 diluted EPS, respectively, because they were anti-dilutive. In addition, 38 5, 381 and 449 stock awards subject to performance conditions were excluded from the 201 4, 201 3 and 201 2 calculations of diluted EPS, respectively. The following table sets forth the computations of basic and diluted earnings per share:
|  | Years ended December 31
|  | 2014 |  | 2013 |  | 2012
Net income |  | $ | 445,374 |  | $ | 327,438 |  | $ | 278,000
Shares: |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  | 31,038 |  |  | 30,957 |  |  | 31,513
Dilutive stock awards |  |  | 474 |  |  | 324 |  |  | 270
Diluted weighted average number of common shares outstanding |  |  | 31,512 |  |  | 31,281 |  |  | 31,783
Basic earnings per share |  | $ | 14.35 |  | $ | 10.58 |  | $ | 8.82
Diluted earnings per share |  | $ | 14.13 |  | $ | 10.47 |  | $ | 8.75

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