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Long-term debt: (Details)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Long-term debt:            
Long         $ 6,641,941 $ 6,488,569
Fair value         6,400,498 6,712,834
Senior secured notes due on March 22, 2035            
Long-term debt:            
Credit line $ 400,000   $ 400,000   7,011,281 6,843,134
Interest $ (10,577) $ (39,105) $ (10,152) $ (43,193)    
Short         330,235 311,372
Long         6,641,941 6,488,569
Fair value         $ 7,697,476 $ 7,082,022