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Company Operations - Summary (Details)	12 Months Ended
	Dec. 31, 2018 item shares
Company Operations
Number of common shares issued for each American Depository Receipts | shares	2
BRAZIL
Company Operations
Number of industrial units	7
Bahia
Company Operations
Number of industrial units	1
Maranho
Company Operations
Number of industrial units	1
Cear
Company Operations
Number of industrial units	1
Par
Company Operations
Number of industrial units	1
So Paulo
Company Operations
Number of industrial units	3

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The number of common shares issued for each American Depository Receipts.

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The number of industrial units.

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