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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 Reconciliation of Beginning and Ending Aggregate Carrying Amount of Asset Retirement Obligations | A reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligation for 2019 and 2018 is shown in the following table.
(Thousands of dollars) | 2019 |  | 2018
Balance at beginning of year | $ | 800,117 |  |  | 447,270 |
Accretion expense | 40,506 |  |  | 27,119 |
Liabilities incurred | 14,759 |  |  | 6,572 |
Liabilities assumed from acquisitions | 64,810 |  |  | 359,643 |
Revisions of previous estimates | (34,371 | ) |  | (20,012 | )
Liabilities settled | (25,544 | ) |  | (11,510 | )
Liabilities associated with assets held for sale | (240 | ) |  | — |
Changes due to translation of foreign currencies | 5,072 |  |  | (8,965 | )
Balance at end of year | 865,109 |  |  | 800,117 |
Current portion of liability at end of year ¹ | (39,315 | ) |  | (47,598 | )
Noncurrent portion of liability at end of year | $ | 825,794 |  |  | 752,519 |
1 Included in Other accrued liabilities on the Consolidated Balance Sheet.

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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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