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Property and Equipment (Tables)
 6 Months Ended
Jun. 30, 2013
Property and Equipment

Property and equipment consisted of the following at June 30, 2013 and December 31, 2012 (in thousands):

 

     June 30,
2013		     December 31,
2012		  

Equipment

    $ 5,636,306      $ 5,387,490   

Oil and natural gas properties

      169,740        156,834   

Buildings

      67,683        66,490   

Land

      11,897        10,413   
  

 

 

    

 

 

  
     5,885,626        5,621,227   

Less accumulated depreciation and depletion

      (2,219,873 )      (2,005,844 ) 
  

 

 

    

 

 

  

Property and equipment, net

    $ 3,665,753      $ 3,615,383