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PENSIONS - Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of funded status:      
Fair value of benefit obligation $ (33,433) $ (34,078) $ (47,215)
Fair value of plan assets 9,962 9,809 $ 15,858
Funded (unfunded) status at end of year (23,471) (24,269)  
Equity securities      
Reconciliation of funded status:      
Fair value of plan assets 9,331 8,801  
Cash      
Reconciliation of funded status:      
Fair value of plan assets 631 1,008  
UK Scheme      
Reconciliation of funded status:      
Fair value of benefit obligation (7,597) (7,073)  
Fair value of plan assets 9,331 8,801  
Funded (unfunded) status at end of year 1,734 1,728  
Marine Scheme      
Reconciliation of funded status:      
Fair value of benefit obligation (25,836) (27,005)  
Fair value of plan assets 631 1,008  
Funded (unfunded) status at end of year $ (25,205) $ (25,997)