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