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PROVISIONS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($)
Oct. 20, 2016
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]      
Expected reimbursements on provisions   $ 0 $ 0
Contingent assets recognized for expected reimbursements of provisions   $ 0 $ 0
Legal proceedings contingent liability      
Disclosure of other provisions [line items]      
Settlement paid $ 1,900,000