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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2011
Property and Equipment

Property and equipment consisted of the following at December 31, 2011 and 2010 (in thousands):

 

     2011     2010  

Equipment

    $ 4,730,925      $ 3,972,891   

Oil and natural gas properties

      131,812        110,749   

Buildings

      64,090        61,425   

Land

      11,467        11,074   
  

 

 

    

 

 

  
     4,938,294        4,156,139   

Less accumulated depreciation and depletion

      (1,771,028 )      (1,535,239 ) 
  

 

 

    

 

 

  

Property and equipment, net

    $ 3,167,266      $ 2,620,900   
  

 

 

    

 

 

  
Summary of Depreciation, Depletion, Amortization and Impairment Expense Related to Property and Equipment and Intangible Assets

Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment and intangible assets for 2011, 2010 and 2009 (in millions):

 

     2011      2010      2009  

Depreciation and impairment expense

    $ 419.2       $ 322.3       $ 280.6   

Amortization expense

      4.1         1.0         —   

Depletion expense

      14.0         10.2         9.2   
  

 

 

     

 

 

     

 

 

  

Total

    $ 437.3       $ 333.5       $ 289.8