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PENSIONS - Narrative (Details)
$ in Thousands
 12 Months Ended
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