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Income taxes (Schedule of Deferred Income Tax Liability) (Details) - MXN ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Deferred tax assets | $ 114,269 | $ 145,285
Deferred tax liabilities: |  |
Total deferred liabilities | 3,622,015 | 3,513,261
Deferred tax liabilities, net | 3,507,746 | 3,367,976
Allowance for doubtful accounts [Member] |  |
Deferred tax assets: |  |
Deferred tax assets | 1,045 | 64,434
Provisions [Member] |  |
Deferred tax assets: |  |
Deferred tax assets |  | 977
Deferred tax liabilities: |  |
Total deferred liabilities | 57,816 |
Advances from customers [Member] |  |
Deferred tax assets: |  |
Deferred tax assets | 113,224 | 79,874
Property, plant and equipment [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 3,224,295 | 3,161,272
Intangible assets from Grupo San [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 310,025 | 298,566
Prepaid expenses [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | $ 29,879 | $ 53,423

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