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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The asset retirement obligations liabilities (ARO) recognized by the Company at December 31, 2019 and 2018 are related to the estimated costs to dismantle and abandon its producing oil and natural gas properties and related equipment. 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. The estimation of future ARO is based on a number of assumptions requiring professional judgment. The Company cannot predict the type of revisions to these assumptions that may be required in future periods due to the availability of additional information such as: prices for oil field services, technological changes, governmental requirements and other factors. Liabilities assumed in 2019, primarily represent obligations assumed as part of the LLOG acquisition. Liabilities assumed in 2018 primarily represent obligations from the MP GOM acquisition. (see Note D).

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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