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Financial risk management: (Details) $ in Thousands, $ in Thousands | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | ---
Asset | $ 56,614,103 |  | $ 29,216,091 |
Liability | $ 22,925,802 |  | $ 6,462,137 |
Currency risk [member] |  |  |  |
Asset |  | $ 50,905 |  | $ 188,765
Liability |  | 148,417 |  | 218,125
Net assets at period closing |  | $ (97,512) |  | $ (29,360)

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