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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of asset retirement obligations | The following table describes the changes in our AROs (both current and long-term) for the years ended December 31, 2020 and 2019 (in thousands):
| 2020 |  | 2019
AROs at January 1, | $ | 28,258 |  |  | $ | — |
Liability incurred during the period | — |  |  | 53,294 |
Liability settled during the period | — |  |  | (28,296) |
Revisions in estimated cash flows | — |  |  | 822 |
Accretion expense | 2,655 |  |  | 2,438 |
AROs at December 31, | $ | 30,913 |  |  | $ | 28,258 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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