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Earnings per share (Tables)
9 Months Ended
Sep. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
Weighted average number of common shares outstanding used to compute basic earnings per share
53,620

 
52,131

 
53,350

 
44,777

Dilutive effect of stock-based awards
1,004

 
1,031

 
1,044

 
1,030

Number of shares used to compute diluted earnings per share
54,624

 
53,162

 
54,394

 
45,807

Schedule of Weighted Average Share Equivalents Outstanding Excluded from Computation of Diluted Earnings per Share
The following table presents the weighted average share equivalents outstanding during each period that were excluded from the computation of diluted earnings per share because the exercise price for these options was greater than the average market price of the Company’s shares of common stock during the respective periods that became anti-dilutive when applying the treasury stock method (in thousands):

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
Anti-dilutive common share equivalents outstanding
97

 
170

 
964

 
49