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Earnings per share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings per share
Earnings per Share
 
Basic earnings per share are computed based upon the weighted average number of shares outstanding and diluted earnings per share are computed based upon the weighted average number of shares and dilutive share equivalents (consisting of incentive stock options, non-qualified stock options, restricted stock units and employee stock purchase plan contributions) outstanding during the periods using the treasury stock method.
 
The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):
 
 
Year Ended December 31,
 
 
2014
 
2013
 
2012
Weighted average number of common shares outstanding used to compute basic earnings per share
 
53,437

 
53,481

 
46,739

Dilutive effect of stock-based awards
 
857

 
1,074

 
1,087

Number of shares used to compute diluted earnings per share
 
54,294

 
54,555

 
47,826


 
There were no significant share equivalents outstanding during the years ended December 31, 2014, 2013 and 2012 that were anti-dilutive when applying the treasury stock method.