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PENSIONS - Reconciliation of Funded Status (Details) - Pensions - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of funded status:      
Projected benefit obligation $ (46,093) $ (51,171) $ (50,376)
Fair value of plan assets 13,121 13,634 $ 12,503
Funded (unfunded) status at end of year (32,972) (37,537)  
Equity securities      
Reconciliation of funded status:      
Fair value of plan assets 12,291 9,921  
Debt securities      
Reconciliation of funded status:      
Fair value of plan assets 0 3,047  
Cash      
Reconciliation of funded status:      
Fair value of plan assets 830 666  
UK Scheme      
Reconciliation of funded status:      
Projected benefit obligation (9,818) (11,654)  
Fair value of plan assets 12,291 12,968  
Funded (unfunded) status at end of year 2,473 1,314  
Marine Scheme      
Reconciliation of funded status:      
Projected benefit obligation (36,275) (39,517)  
Fair value of plan assets 830 666  
Funded (unfunded) status at end of year $ (35,445) $ (38,851)