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Decommissioning and Other Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2015
Activity in the period:    
Accretion of liability $ 480  
Retirement obligations incurred 0  
Revisions in estimated cash flows (12)  
Settlement of retirement obligations (464)  
Ending balance as of June 30 55,482  
Value of asset retirement obligations associated with non-operated properties $ 9,600 $ 9,400