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Asset Retirement Obligation (Tables)
 6 Months Ended
Jun. 30, 2014
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligation Transactions
Balance December 31, 2013 $ 1,780  
 
Accretion expense   57  
Liabilities incurred   26  
Liabilities settled   (47 )
 
Balance June 30, 2014 $ 1,816