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9. Trade receivables (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Trade Receivables Details 3Abstract |  |  |
Write-offs | R$ (184,555) | R$ (171,729) | R$ (177,492)
(Losses)/reversal with state entities - related parties | 1,294 | 21,510 | (7,292)
Losses with private sector / government entities | (61,315) | (75,973) | (144,217)
Losses with wholesale customers | (29,458) | 9,781 | (2,596)
Recoveries | 107,307 | 133,730 | 241,109
Amount reported in selling expenses | R$ (166,727) | R$ (82,681) | R$ (90,488)

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- Definition Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Impairment loss (reversal of impairment loss) recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20_b&doctype=Standard -URIDate 2018-03-16 + Details
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