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PENSIONS - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) defined_benefit_plan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Pensions: |  |  |
Defined contribution scheme, charge to net income | $ 1,600 | $ 1,700 | $ 2,200
Number of defined benefit schemes | defined_benefit_plan | 2 |  |
Defined benefit plan, net periodic benefit cost (credit) excluding service cost, statement of income or comprehensive income [Extensible Enumeration] | General and Administrative Expense, Vessel Operating Expenses |  |
Net periodic benefit cost | $ 1,535 | 1,682 | 1,916
Expected amortization of gain (loss), next fiscal year | (300) | (800) |
Accumulated benefit obligation | 33,200 | 33,900 |
Accumulated other comprehensive income (loss), gain (loss), before tax | 4,500 | 4,400 |
Other comprehensive income, tax on actuarial loss | 400 | 300 | $ 700
Employer contributions | 2,175 | 2,900 |
Administrative Expense And Vessel Operating Expense |  |  |
Pensions: |  |  |
Net periodic benefit cost | 1,400 | 1,600 |
General and Administrative Expense |  |  |
Pensions: |  |  |
Net periodic benefit cost | $ 200 | $ 100 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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