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PENSIONS - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) defined_benefit_plan | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pensions: |  |  |
Defined contribution scheme, charge to net income | $ 1,700 | $ 2,200 | $ 2,100
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] | Administrative (income)/expenses, Vessel operating expenses |  |
Net periodic benefit cost | $ 1,682 | 1,916 | 1,956
Expected amortization of gain (loss), next fiscal year | (800) | (1,100) |
Accumulated benefit obligation | 33,900 | 46,700 |
Accumulated other comprehensive income (loss), gain (loss), before tax | 4,400 | 10,900 |
Other comprehensive income, tax on actuarial loss | 300 | 700 | $ 600
Employer contributions | 2,900 | 2,900 |
Administrative Expense And Vessel Operating Expense |  |  |
Pensions: |  |  |
Net periodic benefit cost | 1,600 | 1,700 |
General and Administrative Expense |  |  |
Pensions: |  |  |
Net periodic benefit cost | $ 100 | $ 200 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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