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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Changes in the Company's asset retirement obligations      
Beginning asset retirement obligations $ 15,420    
Liabilities incurred during period 303    
Revisions in estimated cash flows 1,238    
Accretion expense 264 $ 112  
Ending asset retirement obligations 17,225    
Less: current asset retirement obligations [1] (48)    
Long-term asset retirement obligations $ 17,177   $ 15,166
[1] Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at March 31, 2016.