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ASSET RETIREMENT OBLIGATIONS | 12 Months Ended
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Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract] |
ASSET RETIREMENT OBLIGATIONS | ASSET RETIREMENT OBLIGATIONS AROs at December 31, 2023 and 2022 were (in thousands):
| 2023 |  | 2022
Asset retirement obligations | $ | 16,215 |  |  | $ | 18,113 |
Less: Asset retirement obligations due within one year (1) | 2,576 |  |  | 4,550 |
Long-term asset retirement obligations | $ | 13,639 |  |  | $ | 13,563 |
(1) | Classified as a current liability on the consolidated balance sheets, under the caption “Other current liabilities.” Balance at December 31, 2023 related to remediation work planned for 2024.
Total accretion expense related to AROs was $1.1 million, $1.8 million and $1.4 million during the years ended December 31, 2023, 2022 and 2021, respectively. During the years ended December 31, 2023, 2022 and 2021, our ARO changed as follows (in thousands):
| 2023 |  | 2022 |  | 2021
Balance as of January 1 | $ | 18,113 |  |  | $ | 13,745 |  |  | $ | 14,993 |
Accretion of discount | 1,104 |  |  | 1,830 |  |  | 1,429 |
Change in estimates of existing obligations | 1,366 |  |  | 4,138 |  |  | (763) |
Settlement of obligations | (4,756) |  |  | (455) |  |  | (1,943) |
Foreign currency translation | 388 |  |  | (1,145) |  |  | 29 |
Balance as of December 31 | $ | 16,215 |  |  | $ | 18,113 |  |  | $ | 13,745 |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//410-20/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 20 -Topic 410 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-2 + Details
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