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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations | The following table presents the balance and activity of the Company’s asset retirement obligations (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Beginning balance | $ | 57,168 |  |  | $ | 75,016 |  |  | $ | 60,064 |
Liability incurred upon acquiring and drilling wells | 18 |  |  | 309 |  |  | 2,771 |
Revisions in estimated cash flows (1) | 6,800 |  |  | (17,192) |  |  | 12,208 |
Liability settled or disposed in current period (2) | (8,668) |  |  | (6,866) |  |  | (5,379) |
Accretion (3) | 4,050 |  |  | 5,901 |  |  | 5,352 |
Ending balance | 59,368 |  |  | 57,168 |  |  | 75,016 |
Less: current portion | 17,606 |  |  | 16,467 |  |  | 22,119 |
Asset retirement obligations, net of current | $ | 41,762 |  |  | $ | 40,701 |  |  | $ | 52,897 |
____________________ (1) Revisions for the years ended December 31, 2021, 2020 and 2019 relate primarily to changes in estimated well lives due to changes in oil and natural gas prices and changes in plugging cost estimates. (2) $6.1 million is related to the sale of NPB in February 2021. (3) Included on the Depreciation and depletion - oil and natural gas line item on the Consolidated Statement of Operations.

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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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