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Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of detailed information about the estimated useful lives of property, plant and equipment [text block]
 
Land
No Depreciation
 
Buildings and improvements
30-50 years
 
Plant and production equipment
10-40 years
 
Vehicles, furniture and fixtures, and other equipment
4-10 years