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Available-for-sale financial investments (Details 2) - shares
Dec. 31, 2017
Dec. 31, 2016
Financial Assets Available-for-Sale, Category [Member] | Equity Investments [Member] | Union Andina de Cementos S.A.A. [Member]    
Disclosure of financial assets [line items]    
Number of shares 9,148,373 [1] 256,624 [2]
[1] Represents 7.76% of its common shares.
[2] Represents 0.016% of its common shares.