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Asset Retirement Obligations Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]              
Asset Retirement Obligation $ 4,783     $ 4,783   $ 4,447 $ 4,259
Accretion expense 90 $ 329 $ 88 263 $ 257    
Liabilities incurred for new wells and facilities construction   250   165      
Reductions due to plugged wells and facilities   (82)   (92)      
Revisions in estimates   $ (309)          
Asset retirement obligation - current portion $ 439     $ 439   $ 392