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Earnings Per Share | 9 Months Ended
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Sep. 30, 2020
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 (in thousands, except per share amounts):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  |  | 2020 |  | 2019 |  | 2020 |  | 2019
Net income attributable to common shareholders |  |  | $ | 346,372 |  |  | $ | 312,276 |  |  | $ | 569,950 |  |  | $ | 474,339 |
Weighted average common shares outstanding — basic |  |  | 112,679 |  |  | 112,463 |  |  | 112,639 |  |  | 112,408 |
Net effect of dilutive securities: |  |  |  |  |  |  |  |  |
Contingently issuable performance shares and restricted stock units |  |  | 308 |  |  | 283 |  |  | 273 |  |  | 331 |
Weighted average common shares outstanding — diluted |  |  | 112,987 |  |  | 112,746 |  |  | 112,912 |  |  | 112,739 |
Earnings per weighted-average common share outstanding |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders — basic |  |  | $ | 3.07 |  |  | $ | 2.78 |  |  | $ | 5.06 |  |  | $ | 4.22 |
Net income attributable to common shareholders — diluted |  |  | $ | 3.07 |  |  | $ | 2.77 |  |  | $ | 5.05 |  |  | $ | 4.21 |

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