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PENSIONS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Defined_Benefit_Plan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Defined contribution scheme:      
Defined contribution scheme, charge to net income $ 200 $ 900 $ 500
Pensions      
Defined benefit schemes:      
Number of defined benefit schemes | Defined_Benefit_Plan 2    
Accumulated other comprehensive income, net actuarial loss $ 12,400 15,251  
Other comprehensive income, tax on actuarial loss $ 0 $ 200 $ 100