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Earnings Per Share | 3 Months Ended
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Mar. 31, 2018
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 months ended March 31, 2018 and 2017 (in thousands, except per share amounts):
| Three Months Ended March 31,
| 2018 |  | 2017
Net income attributable to common shareholders | $ | 3,221 |  |  | $ | 23,312 |
Weighted average common shares outstanding — basic | 112,017 |  |  | 111,728 |
Net effect of dilutive securities: |  |  |  |  |
Contingently issuable performance shares and restricted stock units | 476 |  |  | 467 |
Weighted average common shares outstanding — diluted | 112,493 |  |  | 112,195 |
Earnings per weighted-average common share outstanding |  |  |
Net income attributable to common shareholders — basic | $ | 0.03 |  |  | $ | 0.21 |
Net income attributable to common shareholders — diluted | $ | 0.03 |  |  | $ | 0.21 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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