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Income taxes (Schedule of Deferred Income Tax Liability) (Details) - MXN ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Deferred tax assets | $ 132,159 | $ 114,269
Deferred tax liabilities: |  |
Total deferred liabilities | 3,542,265 | 3,622,015
Deferred tax liabilities, net | 3,410,106 | 3,507,746
Allowance for doubtful accounts [Member] |  |
Deferred tax assets: |  |
Deferred tax assets |  | 1,045
Deferred tax assets reduction in allowance for doubtful accounts | (50,476) |
Provisions [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 30,641 | 57,816
Advances from customers [Member] |  |
Deferred tax assets: |  |
Deferred tax assets | 182,635 | 113,224
Property, plant and equipment [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 3,159,719 | 3,224,295
Intangible assets from Grupo San [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | 318,768 | 310,025
Prepaid expenses [Member] |  |
Deferred tax liabilities: |  |
Total deferred liabilities | $ 33,137 | $ 29,879

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