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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income  
Comprehensive Income
(4) Comprehensive Income

Comprehensive income and the components of other comprehensive income were as follows:

 

     Six-month period     Three-month period  
     2011      2010     2011      2010  

Net earnings

   $ 173,659         125,201        94,112         69,167   

Translation adjustment

     2,721         (268     589         (2,287

Change in marketable securities

     174         65        32         24   
                                  

Total comprehensive income

   $ 176,554         124,998        94,733         66,904