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Income tax incurred and deferred: Temporary differences (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Income tax: |  |  |
Net deferred tax assets | $ 260,202 | $ 257,512 |
Deferred tax liability (asset) | 3,165,145 | 3,004,584 | $ 3,081,668
Later than one year |  |  |
Income tax: |  |  |
Deferred tax liabilities | 3,425,347 | 3,262,096 |
Temporary differences |  |  |
Income tax: |  |  |
Net deferred tax assets | 31,019 | 48,079 |
Fair Value of Long term Debt |  |  |
Income tax: |  |  |
Net deferred tax assets | 162,574 | 175,137 |
Allowance for doubtful accounts |  |  |
Income tax: |  |  |
Net deferred tax assets | 66,609 | 34,296 |
Deferred tax liability (asset) | (66,609) | (34,296) | $ (36,874)
Fixed and intangible assets |  |  |
Income tax: |  |  |
Deferred tax liabilities | 3,198,632 | 2,974,108 |
Temporary assets |  |  |
Income tax: |  |  |
Deferred tax liabilities | 226,106 | 287,172 |
Amortization of expenses |  |  |
Income tax: |  |  |
Deferred tax liabilities | 609 | 816 |
Colombia (Airplan) | Fixed and intangible assets |  |  |
Income tax: |  |  |
Deferred tax liabilities | 647,571 | 695,212 |
Puerto Rico (Aerostar) | Fixed and intangible assets |  |  |
Income tax: |  |  |
Deferred tax liabilities | $ 1,032,799 | $ 942,519 |

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