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Net Income Per Share
9 Months Ended
Sep. 30, 2011
Net Income Per Share [Abstract] 
Net Income Per Share
5. Net Income Per Share
     The following table presents the computation of basic and diluted net income per share for the periods presented (in thousands, except per share amounts):
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
    (Unaudited)  
Net income
  $ 19,102     $ 14,275     $ 46,464     $ 28,118  
Basic net income per share:
                               
Weighted average common shares outstanding
    138,679       132,774       137,539       131,517  
 
                       
Basic net income per share
  $ 0.14     $ 0.11     $ 0.34     $ 0.21  
 
                       
Diluted net income per share:
                               
Weighted average common shares outstanding
    138,679       132,774       137,539       131,517  
Weighted average dilutive common share equivalents
    3,929       6,469       4,221       6,796  
 
                       
Weighted average common shares and dilutive common share equivalents
    142,608       139,243       141,760       138,313  
 
                       
Diluted net income per share
  $ 0.13     $ 0.10     $ 0.33     $ 0.20  
 
                       
 
                               
Anti-dilutive options and share-based awards not included in the calculation
    79       1       28       2  
 
                       
     Included in weighted average dilutive common share equivalents are restricted shares associated with the Nitro and DAD acquisitions. These shares were reflected in weighted average dilutive common share equivalents as they were contingent shares during the periods presented.