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Income tax incurred and deferred: Movement (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income tax: |  |
Beginning Balances | $ 3,081,668 | $ 3,033,930
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | (79,459) |
Revaluation effect by conversion Airplan y Aerostar |  | (2,238)
Increase (decrease) in deferred tax liability (asset) | 2,375 | 49,976
Ending Balances | 3,004,584 | 3,081,668
Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (92,794) | 2,981
Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 57,023 | 13,116
Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 38,146 | 33,879
Allowance for doubtful accounts |  |
Income tax: |  |
Beginning Balances | (36,874) | (44,916)
Increase (decrease) in deferred tax liability (asset) | 2,578 | 8,042
Ending Balances | (34,296) | (36,874)
Allowance for doubtful accounts | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 2,467 | (2,468)
Allowance for doubtful accounts | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 111 | 10,510
Concessioned assets |  |
Income tax: |  |
Beginning Balances | 3,079,749 | 2,858,318
Increase (decrease) in deferred tax liability (asset) | (62,827) | 221,431
Ending Balances | 3,016,922 | 3,079,749
Concessioned assets | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (161,556) | 178,236
Concessioned assets | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 60,315 | 7,755
Concessioned assets | Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 38,414 | 35,440
Unrealised foreign exchange gains (losses) |  |
Income tax: |  |
Beginning Balances | 60,008 | 42,575
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | (102,370) |
Revaluation effect by conversion Airplan y Aerostar |  | 20,427
Increase (decrease) in deferred tax liability (asset) | (452) | (2,994)
Ending Balances | (42,814) | 60,008
Unrealised foreign exchange gains (losses) | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (184) | (1,433)
Unrealised foreign exchange gains (losses) | Puerto Rico (Aerostar) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | (268) | (1,561)
Other temporary differences |  |
Income tax: |  |
Beginning Balances | (21,215) | 177,953
IFRS 16 adoption adjustment Conversion revaluation effect Airplan and Aerostar | 22,911 |
Revaluation effect by conversion Airplan y Aerostar |  | (22,665)
Increase (decrease) in deferred tax liability (asset) | 63,076 | (176,503)
Ending Balances | 64,772 | (21,215)
Other temporary differences | Colombia (Airplan) |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | 66,479 | (171,354)
Other temporary differences | Mexico |  |
Income tax: |  |
Increase (decrease) in deferred tax liability (asset) | $ (3,403) | $ (5,149)

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