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PENSIONS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Defined_Benefit_Plan
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Defined contribution scheme:      
Defined contribution scheme, charge to net income $ 1,700 $ 1,300 $ 200
Pensions      
Defined benefit schemes:      
Number of defined benefit schemes | Defined_Benefit_Plan 2    
Net actuarial loss (see note 27) $ 12,799 12,956  
Other comprehensive income, tax on actuarial loss $ (300) $ 0 $ 0