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Earnings Per Share (Tables)
3 Months Ended
Mar. 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 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