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PENSIONS - Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of funded status:      
Fair value of benefit obligation $ (47,215) $ (54,122) $ (49,943)
Fair value of plan assets 15,858 16,864 $ 15,223
Funded (unfunded) status at end of year (31,357) (37,258)  
Equity securities      
Reconciliation of funded status:      
Fair value of plan assets 15,077 15,822  
Cash      
Reconciliation of funded status:      
Fair value of plan assets 781 1,042  
UK scheme      
Reconciliation of funded status:      
Fair value of benefit obligation (11,608) (12,727)  
Fair value of plan assets 15,077 15,822  
Funded (unfunded) status at end of year 3,469 3,095  
Marine scheme      
Reconciliation of funded status:      
Fair value of benefit obligation (35,607) (41,395)  
Fair value of plan assets 781 1,042  
Funded (unfunded) status at end of year $ (34,826) $ (40,353)