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INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill at begining of period $ 0 $ 0  
Goodwill at end of period 0 0 $ 0
Gross      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill at begining of period 11,400 11,400 11,400
Additions during the year 0 0 0
Goodwill at end of period 11,400 11,400 11,400
Accumulated impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill at begining of period (11,400) (11,400) 0
Impairment losses for the year 0 0 (11,400)
Goodwill at end of period $ (11,400) $ (11,400) $ (11,400)