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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligations | The following table summarizes activity related to our ARO liabilities for the years ended December 31, 2021 and 2020:
| Year Ended December 31,
| 2021 |  | 2020
| (in thousands)
Balance at beginning of period | $ | 109,616 |  |  | $ | 83,141 |
Additions(1) | 156,201 |  |  | 21,860 |
Retirements | (1,252) |  |  | (881) |
Accretion expense | 7,121 |  |  | 5,694 |
Revisions | — |  |  | (198) |
Noncontrolling Interest Carve-out | (3,810) |  |  | — |
Sale | (1,869) |  |  | — |
Balance at end of period | 266,007 |  |  | 109,616 |
Less: current portion | (7,905) |  |  | (3,213) |
Balance at end of period, noncurrent portion | $ | 258,102 |  |  | $ | 106,403 |
(1)During the year ended December 31, 2021, our ARO additions related to properties acquired in our 2021 acquisitions. During the year ended December 31, 2020, our ARO additions primarily related to properties acquired in the Titan Acquisition. See NOTE 3 – Acquisitions and Divestitures for additional information.

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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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