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Financial risk management: (Details) $ in Thousands, $ in Thousands | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | ---
Asset | $ 56,181,821 |  | $ 56,614,103 |
Liability | $ (19,500,432) |  | $ (22,925,802) |
Currency risk [member] |  |  |  |
Asset |  | $ 45,003 |  | $ 50,905
Liability |  | (3,149) |  | (148,417)
Net assets at period closing |  | $ 41,854 |  | $ (97,512)

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