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Earnings per Share
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Share
EARNINGS PER SHARE

On May 9, 2018, 77,339,828 shares of our common stock were distributed to Dover stockholders in conjunction with the Separation. See Note 1 — Basis Of Presentation And Separation for additional information. For comparative purposes, and to provide a more meaningful calculation of weighted-average shares outstanding, we have assumed the shares issued in conjunction with the Separation to be outstanding as of the beginning of each period prior to the Separation. In addition, we have assumed the potential dilutive securities outstanding as of May 8, 2018, were outstanding and fully dilutive in each of the periods prior to the Separation.

A reconciliation of the number of shares used for the basic and diluted earnings per share calculation was as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Net income attributable to Apergy
$
25,263

 
$
18,421

 
$
71,989

 
$
50,444

 
 
 
 
 
 
 
 
Weighted-average number of shares outstanding
77,340

 
77,340

 
77,340

 
77,340

Dilutive effect of stock-based compensation
229

 
550

 
402

 
550

Total shares and dilutive securities
77,569

 
77,890

 
77,742

 
77,890

 
 
 
 
 
 
 
 
Basic earnings per share attributable to Apergy
$
0.33

 
$
0.24

 
$
0.93

 
$
0.65

Diluted earnings per share attributable to Apergy
$
0.33

 
$
0.24

 
$
0.93

 
$
0.65