Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Details)

v3.20.1
Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Asset Retirement Obligations    
Estimated Future Cash Undiscounted Amount   $ 29,800
Change in estimated liability $ 11