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Earnings per share (Tables)
3 Months Ended
Mar. 31, 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
 
March 31,
 
2013
 
2012
Weighted average number of common shares outstanding used to compute basic earnings per share
53,046

 
37,269

Dilutive effect of stock-based awards
990

 
885

Number of shares used to compute diluted earnings per share
54,036

 
38,154

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
 
March 31,
 
2013
 
2012
Anti-dilutive common share equivalents outstanding
77

 
710