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Earnings Per Share (Notes)
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Earnings per share
10. Earnings per Share 

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Weighted average number of common shares outstanding used to compute basic earnings per share
52,305

 
52,823

 
52,242

 
52,741

Dilutive effect of stock-based awards
705

 
650

 
678

 
634

Number of shares used to compute diluted earnings per share
53,010

 
53,473

 
52,920

 
53,375



The number of anti-dilutive share equivalents outstanding during the three and six months ended June 30, 2018 and 2017 was insignificant.