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Property And Equipment (Tables)
12 Months Ended
Dec. 31, 2011
Property And Equipment [Abstract]  
Schedule Of Property And Equipment
     2011     2010  

Purchased and internally developed software

   $ 73,561      $ 62,731   

Portable People Meter equipment

     49,601        45,240   

Computer equipment

     21,776        21,231   

Leasehold improvements

     17,833        17,537   

Machinery, furniture and fixtures

     8,598        9,221   
  

 

 

   

 

 

 
     171,369        155,960   

Accumulated depreciation and amortization

     (100,718     (85,628
  

 

 

   

 

 

 

Property and equipment, net

   $ 70,651      $ 70,332   
  

 

 

   

 

 

 
Schedule Of Property And Equipment Additional Information
     For the Years Ended December 31,  

Additional Information

   2011      2010      2009  

Depreciation and Amortization of Property and Equipment:

        

Cost of revenue

   $ 26,319       $ 24,778       $ 20,702   

Selling, general, and administrative

     1,748         1,628         2,207   

Research and development

     475         280         319   
  

 

 

    

 

 

    

 

 

 

Total depreciation and amortization expense

   $ 28,542       $ 26,686       $ 23,228   
  

 

 

    

 

 

    

 

 

 

Impairment charges associated with property and equipment

   $ 162       $ 628       $ —     

Loss on asset disposals

   $ 1,961       $ 2,383       $ 2,088   

Interest capitalized during the year

   $ 39       $ 34       $ 52