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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation [Abstract] |
Reconciliation of the company's asset retirement obligation | A reconciliation of the Company's liability, which the current portion is included in other accrued liabilities on the Consolidated Balance Sheets, for the years ended December 31 was as follows:
| 2020 |  | 2019 |
| (In thousands)
Balance at beginning of year | $ | 417,575 |  | $ | 375,553 |
Liabilities incurred | 11,560 |  | 25,869 |
Liabilities acquired | 1,378 |  | 486 |
Liabilities settled | (5,369) |  | (7,097) |
Accretion expense* | 21,668 |  | 19,789 |
Revisions in estimates | 107 |  | 2,975 |
Balance at end of year | $ | 446,919 |  | $ | 417,575 |
* Includes $20.1 million and $18.3 million in 2020 and 2019, respectively, related to regulatory assets.

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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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