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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of changes in Company's asset retirement obligations | The following table summarizes the changes in the Company’s asset retirement obligations for the years ended December 31, 2019 and 2018 (in thousands).
|  | Year Ended December 31,
|  | 2019 |  | 2018
Beginning asset retirement obligations |  | $ | 31,086 |  |  | $ | 26,256 |
Liabilities incurred during period |  | 3,811 |  |  | 3,566 |
Liabilities settled during period |  | (155 | ) |  | (708 | )
Revisions in estimated cash flows |  | 1,792 |  |  | 442 |
Divestitures during the period |  | (2,145 | ) |  | — |
Accretion expense |  | 1,822 |  |  | 1,530 |
Ending asset retirement obligations |  | 36,211 |  |  | 31,086 |
Less: current asset retirement obligations(1) |  | (619 | ) |  | (1,350 | )
Long-term asset retirement obligations |  | $ | 35,592 |  |  | $ | 29,736 |
__________________ (1) Included in “Accrued liabilities” in the Company’s consolidated balance sheets at December 31, 2019 and 2018.

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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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