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Asset Retirement Obligation (FY) (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Asset Retirement Obligation [Abstract]    
Asset Retirement Obligation Transactions
The following table summarizes the Company’s Asset Retirement Obligation transactions for the nine months ended September 30, 2020 :

Balance December 31, 2019
 
$
1,998
 
Accretion expense
  
94
 
Liabilities incurred
  
—
 
Liabilities settled
  
—
 
Liabilities relieved - sold properties
  
(63
)
Balance September 30, 2020
 
$
2,029
 
The following table summarizes the Company’s Asset Retirement Obligation transactions for the years ended December 31, 2018 and 2019 (in thousands):

Balance December 31, 2017
 
$
2,270
 
     
Accretion expense
  
141
 
Liabilities incurred
  
7
 
Liabilities settled
  
(41
)
Revisions in estimated liabilities
  
(198
)
Balance December 31, 2018
 
$
2,179
 
     
Accretion expense
  
132
 
Liabilities incurred
  
12
 
Liabilities settled
  
(83
)
Liabilities sold properties
  
(55
)
Revisions in estimated liabilities
  
(187
)
Balance December 31, 2019
 
$
1,998