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Significant Accounting Policies (Schedule of Estimated Useful LIves of Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2017
Concessions over the balance of the concession granted to the companies [Member]
Intangible assets [Line Items]
Estimated Useful Life Depreciation in Years
Trademarks [Member]
Intangible assets [Line Items]
Estimated Useful Life Depreciation in Years	15–20
Patents [Member]
Intangible assets [Line Items]
Estimated Useful Life Depreciation in Years	7–20
Customer relationships [Member]
Intangible assets [Line Items]
Estimated Useful Life Depreciation in Years	15–25
Software costs [Member]
Intangible assets [Line Items]
Estimated Useful Life Depreciation in Years	3–10
Agreements with suppliers and non-competition agreement [Member]
Intangible assets [Line Items]
Estimated Useful Life Depreciation in Years	10-15