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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Weighted-average number of shares of common stock used to calculate basic and diluted earnings per share
                 
     Three Months Ended
March 31,
 

(in thousands)

  2013     2012  

Weighted-average number of shares of common stock for calculating basic earnings per share

    25,003       24,639  

Effect of potentially dilutive securities from equity-based compensation

    432       544  
   

 

 

   

 

 

 

Weighted-average number of shares of common stock for calculating diluted earnings per share

    25,435       25,183  
   

 

 

   

 

 

 
Securities not included in the computation of diluted earnings per share
                 
     Three Months Ended
March 31,
 

(in thousands)

  2013     2012  

Options to purchase shares of common stock

    569       139