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SIGNIFICANT ACCOUNTING POLICIES (Details 5)
 12 Months Ended
Dec. 31, 2018
Buildings and other constructions [member]  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 33
Installations [member]  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 10
Furniture and fixtures [member]  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 10
Vehicles and equipment [member]  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 5
Computer hardware [member]  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 4