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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Reconciliation of Shares Used to Compute Basic and Diluted 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Weighted average number of common shares outstanding used to compute basic earnings per share
52,500

 
53,275

 
52,660

 
53,281

Dilutive effect of stock-based awards
673

 
493

 
659

 
506

Number of shares used to compute diluted earnings per share
53,173

 
53,768

 
53,319

 
53,787