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Depreciation and amortization (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation and amortization (Tables) [Abstract]
Amortization expenses	R$ (3,331,240)	R$ (2,516,777)	R$ (1,884,281)
Depreciation	(1,237,328)	(1,141,636)	(1,057,722)
Total	R$ (4,568,568)	R$ (3,658,413)	R$ (2,942,003)

X

- Definition

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

+ References

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- Definition

The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives.

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The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives.

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