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Asset Retirement Obligation (FY) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 | Dec. 31, 2019
Asset Retirement Obligation [Abstract] |  |
Asset Retirement Obligation | (6) Asset Retirement Obligation Our asset retirement obligations represent the estimated present value of the amount we will incur to plug, abandon, and remediate our producing properties at the end of their productive lives in accordance with applicable laws. The following table summarizes the Company’s Asset Retirement Obligation transactions for the nine months ended September 30, 2020 (in thousands):
Balance December 31, 2019 |  | $ | 1,998 |
Accretion expense |  |  | 94 |
Liabilities incurred |  |  | — |
Liabilities settled |  |  | — |
Liabilities relieved - sold properties |  |  | (63 | )
Balance September 30, 2020 |  | $ | 2,029 |
| 11. Asset Retirement Obligation Our asset retirement obligations represent the estimated present value of the amount we will incur to plug, abandon and remediate our producing properties at the end of their productive lives in accordance with applicable laws. 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 |
The revisions in estimated liabilities resulted from change in timing of wells to be plugged, change in inflation factor, and change in current plugging costs.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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