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33. Net financial expense (Details) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Financial income |  | $ 671,783 | $ 453,804 | $ 384,593
Financial expenses |  | (4,976,719) | (2,570,256) | (2,589,227)
Other financial expense |  | (1,965,320) | (168,468) | (87,303)
Net financial expense |  | (6,270,256) | (2,284,920) | (2,291,937)
Commercial interest |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Financial income |  | 273,457 | 177,655 | 262,536
Financial expenses |  | (2,958,366) | (1,716,843) | (2,028,136)
Financial interest |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Financial income |  | 398,326 | 276,149 | 122,057
Interest and other |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Financial expenses |  | (1,987,092) | (819,377) | (535,721)
Fiscal interest |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Financial expenses |  | (22,752) | (31,153) | (18,762)
Bank fees and expenses |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Financial expenses |  | (8,509) | (2,883) | (6,608)
Exchange differences |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Other financial expense |  | (2,629,966) | (564,056) | (911,819)
Adjustment to present value of receivables |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Other financial expense |  | (327) | (431) | 5,749
Changes in fair value of financial assets |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Other financial expense | [1] | 746,532 | 474,896 | 891,773
Net gain from the repurchase of Corporate Notes |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Other financial expense |  | 4,539 | 0 | 90
Other financial expense |  |  |  |
SummaryOfNetFinancialExpenseLineItems [Line Items] |  |  |  |
Other financial expense |  | $ (86,098) | $ (78,877) | $ (73,096)
[1] | Includes changes in the fair value of financial assets on cash equivalents as of December 31, 2018, 2017 and 2016 for $ 43.4 million, $ 37.3 million and $ 39.6 million, respectively.

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