XML 56 R46.htm IDEA: XBRL DOCUMENT v3.20.1
Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning asset retirement obligations $ 2,164  
Liabilities incurred 23  
Accretion expense 44 $ 54
Divestitures (10)  
Revision of estimates (2)  
Ending asset retirement obligations $ 2,219