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Significant accounting judgments, estimates and assumptions (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred taxes |  |  |
Available tax loss carry-forwards | $ 1,501,630 | $ 111,083 |
Tax loss carry-forwards used | $ 16,378 | $ 195,116 | $ 1,618,850
Mexico |  |  |
Deferred taxes |  |  |
Period in which tax losses can be carried forward | 10 years |  |
Costa Rica |  |  |
Deferred taxes |  |  |
Period in which tax losses can be carried forward | 3 years |  |

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