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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 Obligation | The following tables present the details of AROs which are included on the accompanying Consolidated Balance Sheets in Other deferred credits and other liabilities (in thousands):
| December 31, 2020 | Liabilities Incurred | Liabilities Settled | Accretion |  | Revisions to Prior Estimates | December 31, 2021
Electric Utilities | $ | 29,157 |  | $ | — |  | $ | (978) |  | $ | 1,315 |  |  | $ | 595 |  | $ | 30,089 |
Gas Utilities (a) | 42,274 |  | — |  | (66) |  | 1,733 |  |  | 1,514 |  | 45,455 |
Total | 71,431 |  | $ | — |  | $ | (1,044) |  | $ | 3,048 |  |  | $ | 2,109 |  | $ | 75,544 |
| December 31, 2019 | Liabilities Incurred | Liabilities Settled | Accretion |  | Revisions to Prior Estimates | December 31, 2020
Electric Utilities (b) (c) | $ | 28,120 |  | $ | 1,217 |  | $ | (185) |  | $ | 1,230 |  |  | $ | (1,225) |  | $ | 29,157 |
Gas Utilities (d) | 36,085 |  | 4,782 |  | (132) |  | 1,539 |  |  | — |  | 42,274 |
Total | $ | 64,205 |  | $ | 5,999 |  | $ | (317) |  | $ | 2,769 |  |  | $ | (1,225) |  | $ | 71,431 |
____________________ (a) The Revisions to Prior Estimates were primarily driven by changes in estimates associated with natural gas wells. (b) Liabilities incurred were related to new wind assets. (c) The Revisions to Prior Estimates were primarily driven by changes in estimated costs associated with back-filling the pit with overburden removed during the mining process. (d) Liabilities incurred were driven by an increase in gas pipeline miles; which increases our legal liability for retirement of gas pipelines, specifically to purge and cap these lines in accordance with federal regulations.

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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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