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Commitments and Contingencies - Asset Retirement Obligations (Details)
$ in Thousands
9 Months Ended
Dec. 31, 2017
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Balance at beginning of period $ 8,181
Liabilities incurred 422
Liabilities assumed in acquisitions 21
Liabilities settled (549)
Accretion expense 655
Balance at end of period $ 8,730