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Consolidated Statements of Changes in Equity (Parenthetical)
Apr. 25, 2018
$ / $
Dec. 31, 2017
$ / $
Dec. 31, 2017
Q / $
Dec. 31, 2017
₡ / $
Dec. 31, 2016
$ / $
Dec. 31, 2016
Q / $
Dec. 31, 2016
₡ / $
Consolidated Statements of Changes in Equity              
Convenience translation to U.S. dollars 18.8628 19.7354 7.3448 572.5600 20.6640 7.5221 561.1000