Earnings Per Share (Tables)

12 Months Ended

Dec. 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 continuing operations attributable to common shareholders for the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share amounts):

	2017		2016		2015
Net income attributable to common shareholders	$	488,456	$	442,034	$	437,257
Weighted average common shares outstanding — basic	111,839		111,409		111,026
Net effect of dilutive securities:
Contingently issuable performance shares and restricted stock units	528		637		526
Weighted average common shares outstanding — diluted	112,367		112,046		111,552
Earnings per weighted-average common share outstanding
Net income attributable to common shareholders - basic	$	4.37	$	3.97	$	3.94
Net Income attributable to common shareholders - diluted	$	4.35	$	3.95	$	3.92