Significant Accounting Policies (Schedule of Estimated Useful Lives for Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2018
Others [Member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives	5-27 years
Concessions [Member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives	33 years	[1]
Customer relationships [Member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives	1-12 years
Software [Member]
Disclosure of detailed information about intangible assets [line items]
Estimated useful lives	3-10 years

[1] The concessions are amortized over the remaining life of the licenses from the date of the business combination.