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ACCOUNTING POLICIES (Impairment) (Details)
Dec. 31, 2017
Dec. 31, 2016
Disclosure of impairment loss and reversal of impairment loss [line items]    
Discount rate used in current estimate of value in use 11.49%  
Cash-generating units    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Discount rate used in current estimate of value in use 11.49% 10.82%