| 12.31.17 | 12.31.16 | 12.31.15 | ||||
| Other operating income | ||||||
| Services provided to third parties | 53,367 | 62,495 | 59,809 | |||
| Commissions on municipal taxes collection | 31,686 | 21,441 | 14,775 | |||
| Related parties | 36.a | 4,381 | 500 | - | ||
| Income from non-reimbursable customer contributions |
2,764 | 764 | 764 | |||
| Others | 4,859 | 2,726 | 4,613 | |||
| Total other operating income | 97,057 | 87,926 | 79,961 | |||
| Other operating expense | ||||||
| Gratifications for services | (49,203) | (35,442) | (43,192) | |||
| Cost for services provided to third parties | (37,061) | (31,946) | (52,421) | |||
| Severance paid | (17,382) | (15,697) | (11,801) | |||
| Debit and Credit Tax | (293,913) | (156,152) | (85,138) | |||
| Other expenses - FOCEDE | - | (14,653) | (59,563) | |||
| Provision for contingencies | (337,989) | (151,047) | (226,449) | |||
| Disposals of property, plant and equipment | (10,540) | (40,466) | (3,513) | |||
| Other | (12,391) | (18,543) | (20,430) | |||
| Total other operating expense | (758,479) | (463,946) | (502,507) | |||
| Other operating expense, net | (661,422) | (376,020) | (422,546) | |||