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Asset Retirement Obligation (Tables)
6 Months Ended
Jun. 30, 2013
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligation Transactions
Balance December 31, 2012 $ 2,099  
 
Accretion expense   70  
Liabilities incurred   3  
Liabilities settled   (12 )
 
Balance June 30, 2013 $ 2,160