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Income tax incurred and deferred: Movement (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income tax: |  |
Beginning Balances | $ 3,004,584 | $ 3,081,668
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | 65,777 | (79,459)
Increase (decrease) in deferred tax liability (asset) | 94,784 | 2,375
Ending Balances | 3,165,145 | 3,004,584
Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (65,686) | (92,794)
Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 117,924 | 57,023
Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 42,546 | 38,146
Allowance for doubtful accounts |  |
Income tax: |  |
Beginning Balances | (34,296) | (36,874)
Increase (decrease) in deferred tax liability (asset) | (32,313) | 2,578
Ending Balances | (66,609) | (34,296)
Allowance for doubtful accounts | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (11,390) | 2,467
Allowance for doubtful accounts | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (20,923) | 111
Concessioned assets |  |
Income tax: |  |
Beginning Balances | 3,016,922 | 3,079,749
Increase (decrease) in deferred tax liability (asset) | 84,970 | (62,827)
Ending Balances | 3,101,892 | 3,016,922
Concessioned assets | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (73,994) | (161,556)
Concessioned assets | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 115,197 | 60,315
Concessioned assets | Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 43,767 | 38,414
Unrealised foreign exchange gains (losses) |  |
Income tax: |  |
Beginning Balances | (42,814) | 60,008
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | 141,236 | (102,370)
Increase (decrease) in deferred tax liability (asset) | (1,682) | (452)
Ending Balances | 96,740 | (42,814)
Unrealised foreign exchange gains (losses) | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (461) | (184)
Unrealised foreign exchange gains (losses) | Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (1,221) | (268)
Other temporary differences |  |
Income tax: |  |
Beginning Balances | 64,772 | (21,215)
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | (75,456) | 22,911
Increase (decrease) in deferred tax liability (asset) | 43,809 | 63,076
Ending Balances | 33,125 | 64,772
Other temporary differences | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 20,159 | 66,479
Other temporary differences | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | $ 23,650 | $ (3,403)

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