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Long term debt: (Details)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2017
USD ($)
Jun. 24, 2015
USD ($)
Mar. 22, 2013
MXN ($)
Mar. 22, 2013
USD ($)
Intererst $ 1,804   $ 27,606        
Long 7,149,177          
Fair value 10,791,338   $ 4,765,630        
Senior secured notes due on March 22, 2035 [Member]              
Credit line 7,489,465     $ 400,000 $ 50,000 $ 4,471,000 $ 350,000
Intererst 126,712 $ 6,444          
Short 340,288            
Long 7,149,177            
Fair value $ 6,766,798