Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Details)

v3.19.3
Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Estimated Future Cash Undiscounted Amount $ 29,700  
Change in estimated liability (59) $ 2,840
Pathfinder properties    
Change in estimated liability $ (59)