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Decommissioning Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Summary of the activity for the Company's decommissioning liabilities      
Decommissioning liabilities, December 31, 2013 and 2012, respectively $ 83,519 $ 93,053  
Liabilities acquired and incurred 866 360  
Liabilities settled   (87)  
Accretion 3,324 4,269  
Revision estimated liabilities (266)    
Total decommissioning liabilities, September 30, 2014 and 2013, respectively 87,443 97,595  
Less: current portion of decommissioning liabilities at September 30, 2014 and 2013, respectively     27,322
Long-term decommissioning liabilities, September 30, 2014 and 2013, respectively $ 87,443   $ 56,197