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Asset Retirement Obligation (Tables)
3 Months Ended
Mar. 31, 2014
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligation Transactions
Balance December 31, 2013 $ 1,780  
 
Accretion expense   28  
Liabilities incurred   9  
Liabilities settled   )
 
Balance March 31, 2014 $ 1,782