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PENSIONS - Reconciliation of Funded Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of funded status:      
Projected benefit obligation $ (49,943) $ (46,093) $ (51,171)
Fair value of plan assets 15,223 13,121 $ 13,634
Funded (unfunded) status at end of year (34,720) (32,972)  
Equity securities      
Reconciliation of funded status:      
Fair value of plan assets 14,323 12,291  
Cash      
Reconciliation of funded status:      
Fair value of plan assets 900 830  
UK Scheme      
Reconciliation of funded status:      
Projected benefit obligation (11,479) (9,818)  
Fair value of plan assets 14,323 12,291  
Funded (unfunded) status at end of year 2,844 2,473  
Marine Scheme      
Reconciliation of funded status:      
Projected benefit obligation (38,464) (36,275)  
Fair value of plan assets 900 830  
Funded (unfunded) status at end of year $ (37,564) $ (35,445)