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Earnings Per Share | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | 9. 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 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 are excluded from the calculation of diluted EPS in the event they are subject to performance conditions or antidilutive. The following stock awards were excluded from the calculation of diluted EPS:
|  | Year ended December 31,
|  | 2015 |  | 2014 |  | 2013
Stock awards subject to performance conditions |  |  | 266 |  |  | 385 |  |  | 381
Stock awards that were antidilutive |  |  | 289 |  |  | 232 |  |  | 393
Total stock awards excluded from diluted earnings per share |  |  | 555 |  |  | 617 |  |  | 774
The following table sets forth the computations of basic and diluted earnings per share:
|  | Year ended December 31,
|  | 2015 |  | 2014 |  | 2013
Net income |  | $ | 475,602 |  | $ | 445,374 |  | $ | 327,438
Shares: |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  | 31,092 |  |  | 31,038 |  |  | 30,957
Dilutive stock awards |  |  | 402 |  |  | 474 |  |  | 324
Diluted weighted average number of common shares outstanding |  |  | 31,494 |  |  | 31,512 |  |  | 31,281
Basic earnings per share |  | $ | 15.30 |  | $ | 14.35 |  | $ | 10.58
Diluted earnings per share |  | $ | 15.10 |  | $ | 14.13 |  | $ | 10.47

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