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PENSIONS (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
defined_benefit_plan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined benefit schemes:      
Defined contribution scheme, charge to net income $ 2,100 $ 2,400 $ 1,900
Number of defined benefit schemes | defined_benefit_plan 2    
Expected amortization of gain (loss), next fiscal year $ (800) (800)  
Accumulated benefit obligation 53,400 49,200  
Employer contributions 2,900 3,411  
Accumulated other comprehensive income (loss), gain (loss), before tax 15,900 12,200  
Other comprehensive income, tax on actuarial loss $ 600 $ 500 $ 400