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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
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 continuing operations attributable to common shareholders for the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share amounts):
| 2017 |  | 2016 |  | 2015
Net income attributable to common shareholders | $ | 488,456 |  |  | $ | 442,034 |  |  | $ | 437,257 |
Weighted average common shares outstanding — basic | 111,839 |  |  | 111,409 |  |  | 111,026 |
Net effect of dilutive securities: |  |  |  |  |  |  |  |
Contingently issuable performance shares and restricted stock units | 528 |  |  | 637 |  |  | 526 |
Weighted average common shares outstanding — diluted | 112,367 |  |  | 112,046 |  |  | 111,552 |
Earnings per weighted-average common share outstanding |  |  |  |  |
Net income attributable to common shareholders - basic | $ | 4.37 |  |  | $ | 3.97 |  |  | $ | 3.94 |
Net Income attributable to common shareholders - diluted | $ | 4.35 |  |  | $ | 3.95 |  |  | $ | 3.92 |

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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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