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Earnings per share
3 Months Ended
Mar. 31, 2015
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
 
March 31,
 
2015
 
2014
Weighted average number of common shares outstanding used to compute basic earnings per share
51,519

 
54,104

Dilutive effect of stock-based awards
690

 
871

Number of shares used to compute diluted earnings per share
52,209

 
54,975



The amount of anti-dilutive share equivalents outstanding during the three months ended March 31, 2015 and 2014 were insignificant.