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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
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 the three months ended March 31, 2017 and 2016 (in thousands, except per share amounts):
 
Three Months Ended 
 March 31,
 
 
2017
 
2016
 
Net income attributable to common shareholders
$
23,312

 
$
4,453

 
Weighted average common shares outstanding — basic
111,728

 
111,296

 
Net effect of dilutive securities:
 

 
 

 
Contingently issuable performance shares and restricted stock units
467

 
551

 
Weighted average common shares outstanding — diluted
112,195

 
111,847

 
Earnings per weighted-average common share outstanding
 
 
 
 
Net income attributable to common shareholders — basic
$
0.21

 
$
0.04

 
Net income attributable to common shareholders — diluted
$
0.21

 
$
0.04