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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017 (in thousands, except per share amounts):
 
2019
 
2018
 
2017
Net income attributable to common shareholders
$
538,320

 
$
511,047

 
$
488,456

Weighted average common shares outstanding — basic
112,443

 
112,129

 
111,839

Net effect of dilutive securities:
 

 
 

 
 

Contingently issuable performance shares and restricted stock units
315

 
421

 
528

Weighted average common shares outstanding — diluted
112,758

 
112,550

 
112,367

Earnings per weighted-average common share outstanding
 
 
 
 
 
Net income attributable to common shareholders - basic
$
4.79

 
$
4.56

 
$
4.37

Net income attributable to common shareholders - diluted
$
4.77

 
$
4.54

 
$
4.35