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Asset Retirement Obligation (Q3) (Tables) | 9 Months Ended | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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