Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Details)

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Asset Retirement Obligations (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Asset Retirement Obligations  
Obligations incurred $ 3,046
Accretion expense 34
Asset Retirement Obligation, Ending Balance $ 3,080