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10. Prepaid expenses (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expenses Details    
Rents R$ 329,421 R$ 196,944
Advertising and publicity 67,321 37,833
Deferred Stock Plan, net 37,591 44,719
Insurance premiums 39,629 46,896
Software maintenance 8,237 12,478
Other prepaid expenses 14,733 7,531
Prepaid expenses, total 496,932 346,401
Current 150,046 123,883
Non-current R$ 346,886 R$ 222,518