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Property And Equipment (Tables)
9 Months Ended
Sep. 30, 2011
Property And Equipment 
Property And Equipment, Stated At Cost
     December 31,
2010
    September 30,
2011
 

Land

   $ 8,201      $ 8,201   

Buildings and leasehold improvements

     274,716        294,944   

Fixed assets not placed in service

     13,843        10,163   

Information technology systems under development

     28,808        32,636   

Furniture and equipment

     234,132        257,312   

Computer equipment and software

     203,867        222,854   
  

 

 

   

 

 

 

Total property and equipment

     763,567        826,110   

Less accumulated depreciation

     (377,704     (421,741
  

 

 

   

 

 

 

Property and equipment, net

   $ 385,863      $ 404,369