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PENSIONS (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
defined_benefit_plan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Defined benefit schemes:      
Defined contribution scheme, charge to net income $ 2,400 $ 1,900 $ 1,700
Number of defined benefit schemes | defined_benefit_plan 2    
Expected amortization of gain (loss), next fiscal year $ (800) (1,400)  
Accumulated benefit obligation 49,200 45,300  
Employer contributions 3,411 3,617  
Accumulated other comprehensive income (loss), gain (loss), before tax (12,200) (9,200)  
Other comprehensive income, tax on actuarial loss $ 500 $ 400 $ 300