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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of earnings per weighted average common share outstanding | 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, 2018, 2017 and 2016 (in thousands, except per share amounts):
| 2018 |  | 2017 |  | 2016
Net income attributable to common shareholders | $ | 511,047 |  |  | $ | 488,456 |  |  | $ | 442,034 |
Weighted average common shares outstanding — basic | 112,129 |  |  | 111,839 |  |  | 111,409 |
Net effect of dilutive securities: |  |  |  |  |  |  |  |
Contingently issuable performance shares and restricted stock units | 421 |  |  | 528 |  |  | 637 |
Weighted average common shares outstanding — diluted | 112,550 |  |  | 112,367 |  |  | 112,046 |
Earnings per weighted-average common share outstanding |  |  |  |  |
Net income attributable to common shareholders - basic | $ | 4.56 |  |  | $ | 4.37 |  |  | $ | 3.97 |
Net Income attributable to common shareholders - diluted | $ | 4.54 |  |  | $ | 4.35 |  |  | $ | 3.95 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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