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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)