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Earnings Per Share
6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Earnings per share
8. 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,
 
2017
 
2016
 
2017
 
2016
Weighted average number of common shares outstanding used to compute basic earnings per share
52,823

 
53,422

 
52,741

 
53,284

Dilutive effect of stock-based awards
650

 
489

 
634

 
499

Number of shares used to compute diluted earnings per share
53,473

 
53,911

 
53,375

 
53,783



During the three months ended June 30, 2017 and 2016, and the six months ended June 30, 2017, there were no significant share equivalents that were anti-dilutive when applying the treasury stock method. During the six months ended June 30, 2016, there were 445,036 share equivalents that were excluded from the computation of diluted earnings because they were anti-dilutive when applying the treasury stock method.