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PENSIONS - Asset Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pensions:      
Fair value of plan assets $ 15,858 $ 16,864 $ 15,223
Equity      
Pensions:      
Fair value of plan assets 15,077 15,822  
Cash      
Pensions:      
Fair value of plan assets 781 1,042  
UK scheme      
Pensions:      
Fair value of plan assets $ 15,077 $ 15,822  
Target allocation 100.00% 100.00%  
UK scheme | Equity      
Pensions:      
Target allocation 100.00% 100.00%  
Marine scheme      
Pensions:      
Fair value of plan assets $ 781 $ 1,042  
Target allocation 100.00% 100.00%  
Marine scheme | Cash      
Pensions:      
Target allocation 100.00% 100.00%