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31. Supplemental cash flow information (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental Cash Flow Information Details |  |  |
Total additions to intangible assets (Note 14 (b)) | R$ 3,490,298 | R$ 3,855,831 | R$ 3,604,442
Items not affecting cash (see breakdown below) | (1,532,518) | (1,747,664) | (1,207,090)
Total additions to intangible assets as per statement of cash flows | 1,957,780 | 2,108,167 | 2,397,352
Investments and financing operations affecting intangible assets but not cash: |  |  |
Interest capitalized in the year | 649,048 | 700,743 | 466,544
Contractors payable | 213,340 | 57,431 | (57,041)
Program contract commitments | 95,126 | 4,262 | 136,543
Public Private Partnership - Sao Lourenco PPP | 501,591 | 893,181 | 548,978
Leases | 3,078 | 10,534 | 36,877
Construction margin | (70,335) | (81,513) | (72,908)
Other | 0 | 0 | 2,281
Total | R$ 1,532,518 | R$ 1,747,664 | R$ 1,207,090

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