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23. Shareholders' Equity (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shareholders Equity Details 1      
Net income for the year attributable to shareholders of the Company R$ 1,574,306 R$ 1,561,585 R$ 1,503,466
Minimum mandatory dividends 787,153    
Interim dividends paid (461,868)    
Mandatory dividends payable – Current liabilities 325,285    
Additional dividends to the minimum mandatory dividends – shareholders’ equity 163,742    
Dividends payable 489,027    
Legal reserve 78,716    
Statutory investments reserve R$ 544,695