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Depreciation and Amortization (Tables)
12 Months Ended
Dec. 31, 2012
Depreciation and Amortization Expense Excluded from Operating Expenses
The amounts of depreciation and amortization expense excluded from the following operating expenses in its Statement of Operations are:

 

     Year Ended December 31,  
     2012      2011      2010  

Direct expenses

   $ 277,662       $ 283,720       $ 297,517   

General and administrative expenses

     4,137         4,224         5,033   

Corporate expenses

     14,284         11,695         10,153   
  

 

 

    

 

 

    

 

 

 
   $ 296,083       $ 299,639       $ 312,703