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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2011
Asset Retirement Obligations (Tables) [Abstract]  
Reconciliation of asset retirement obligations
Asset retirement obligations at December 31, 2010
  $ 1,514  
Accretion
    46  
Liabilities incurred
    1  
Revision in estimated cash flows
    (1 )
Liabilities settled
    (7 )
 
     
Asset retirement obligations at June 30, 2011
    1,553  
Less amount included in current liabilities
    (15 )
 
     
 
  $ 1,538