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Financial Instruments (Schedule of Book Value of Assets and liabilities Denominated in Foreign Currency) (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Short - term assets   $ 26,100,965   $ 22,866,256
Short - term liabilities   8,992,168   7,480,069
Currency risk [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Short - term assets   11,649,108   11,228,846
Short - term liabilities   5,567,083   4,763,682
Net monetary asset position in foreign currency   $ 6,082,025   $ 6,465,164
Currency risk [Member] | USD [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Net monetary asset position in foreign currency $ 309,414   $ 327,592