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Earnings Per Share
6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Earnings per share
11. 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,
 
2016
 
2015
 
2016
 
2015
Weighted average number of common shares outstanding used to compute basic earnings per share
53,422

 
51,978

 
53,284

 
51,749

Dilutive effect of stock-based awards
489

 
655

 
499

 
686

Number of shares used to compute diluted earnings per share
53,911

 
52,633

 
53,783

 
52,435



During the six months ended June 30, 2016, there were 445,036 share equivalents outstanding that were excluded from the computation of diluted earnings per share because they were anti-dilutive when applying the treasury stock method. During the three months ended June 30, 2016, and the three and six months ended June 30, 2015 the amount of anti-dilutive share equivalents outstanding were insignificant.