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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Changes in the Company's asset retirement obligations          
Beginning asset retirement obligations     $ 15,420    
Liabilities incurred during period     1,044    
Liabilities settled during period     (119)    
Revisions in estimated cash flows     1,662    
Accretion expense $ 289 $ 132 552 $ 244  
Ending asset retirement obligations 18,559   18,559    
Less: current asset retirement obligations [1] (61)   (61)    
Long-term asset retirement obligations $ 18,498   $ 18,498   $ 15,166
[1] Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at June 30, 2016.