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9. PROPERTY, PLANT AND EQUIPMENT (Details 2)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful life 39 years 41 years
Machinery, equipment and facilities    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful life 21 years 18 years
Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful life 12 years 12 years
Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated useful life 17 years 14 years