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Earnings per share (Tables)
12 Months Ended
Dec. 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):
 
 
Year Ended December 31,
 
 
2013
 
2012
 
2011
Weighted average number of common shares
 
53,481

 
46,739

 
36,876

Dilutive effect of stock-based awards
 
1,074

 
1,087

 
882

Number of shares used to compute diluted earnings per share
 
54,555

 
47,826

 
37,758

Schedule of Weighted Average Share Equivalents Outstanding Excluded from Computation of Diluted Earnings per Share
Also excluded from the computation of diluted earnings per share were other share equivalents that became anti-dilutive when applying the treasury stock method.
 
 
Year Ended December 31,
 
 
2013
 
2012
 
2011
Anti-dilutive common share equivalents outstanding
 
7

 
83

 
1,039