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Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2011
Asset Retirement Obligations 
Asset Retirement Obligations
     Nine Months Ended
September 30,		  
     2011     2010  
     (In thousands)  

ARO liability, January 1:

    $ 69,265      $ 56,404   

Accretion of discount

      2,598        2,138   

Liability incurred (1)

     12,674        2,901   

Liability settled

      (831 )      (622 ) 

Revision of estimates (2 )

     9,096        3,822   
  

 

 

    

 

 

  

ARO liability, September 30:

      92,802        64,643   

Less current portion

      2,074        1,617   
  

 

 

    

 

 

  

Total long-term ARO liability

    $ 90,728      $ 63,026   
  

 

 

    

 

 

  

(1) Liability incurred in 2011 includes estimates for new wells acquired.

(2) Plugging liability estimates were revised upward in both 2011 and 2010 due to increases in the cost of services used to plug wells over the preceding years.