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Earnings Per Share | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following table presents the calculation of Pinnacle West’s basic and diluted earnings per share for the three and nine months ended September 30, 2015 and 2014 (in thousands, except per share amounts):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Net income attributable to common shareholders | $ | 257,116 |  |  | $ | 243,961 |  |  | $ | 396,140 |  |  | $ | 392,185 |
Weighted average common shares outstanding — basic | 111,036 |  |  | 110,686 |  |  | 110,984 |  |  | 110,579 |
Net effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Contingently issuable performance shares and restricted stock units | 580 |  |  | 417 |  |  | 506 |  |  | 383 |
Weighted average common shares outstanding — diluted | 111,616 |  |  | 111,103 |  |  | 111,490 |  |  | 110,962 |
Earnings per average common share attributable to common shareholders — basic | $ | 2.32 |  |  | $ | 2.20 |  |  | $ | 3.57 |  |  | $ | 3.55 |
Earnings per average common share attributable to common shareholders — diluted | $ | 2.30 |  |  | $ | 2.20 |  |  | $ | 3.55 |  |  | $ | 3.53 |

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