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Earnings Per Share
9 Months Ended
Sep. 30, 2021
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 (in thousands, except per share amounts):
 Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Net income attributable to common shareholders$339,798 $346,372 $591,136 $569,950 
Weighted average common shares outstanding — basic
112,923 112,679 112,878 112,639 
Net effect of dilutive securities:
Contingently issuable performance shares and restricted stock units
294 308 300 273 
Weighted average common shares outstanding — diluted
113,217 112,987 113,178 112,912 
Earnings per weighted-average common share outstanding
Net income attributable to common shareholders — basic
$3.01 $3.07 $5.24 $5.06 
Net income attributable to common shareholders — diluted
$3.00 $3.07 $5.22 $5.05