XML 215 R192.htm IDEA: XBRL DOCUMENT v3.19.1
Borrowing costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Borrowing costs [abstract]    
Capitalization rate of costs for capitalized interest, property, plant and equipment 4.00% 4.00%
Amount of costs for interest capitalized in ThUS$ $ 5,021 $ 4,382