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PENSIONS - Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of funded status:      
Fair value of benefit obligation $ (34,078) $ (47,215) $ (54,122)
Fair value of plan assets 9,809 15,858 $ 16,864
Funded (unfunded) status at end of year (24,269) (31,357)  
Equity securities      
Reconciliation of funded status:      
Fair value of plan assets 8,801 15,077  
Cash      
Reconciliation of funded status:      
Fair value of plan assets 1,008 781  
UK Scheme      
Reconciliation of funded status:      
Fair value of benefit obligation (7,073) (11,608)  
Fair value of plan assets 8,801 15,077  
Funded (unfunded) status at end of year 1,728 3,469  
Marine Scheme      
Reconciliation of funded status:      
Fair value of benefit obligation (27,005) (35,607)  
Fair value of plan assets 1,008 781  
Funded (unfunded) status at end of year $ (25,997) $ (34,826)