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31. Supplemental cash flow information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information Tables |
Supplemental cash flow information |
| 2017 | 2016 | 2015
Total additions to intangible assets (Note 14 (b)) | 3,490,298 | 3,855,831 | 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 (Note 14 (d)) | 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 - São Lourenço PPP (Note 14 (g)) | 501,591 | 893,181 | 548,978
Leases | 3,078 | 10,534 | 36,877
Construction margin (Note 24) | 70,335 | 81,513 | 72,908
Other | - | - | 2,281
Total | 1,532,518 | 1,747,664 | 1,207,090

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