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Financial instruments (Details 14) - Series C bonds [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Principal payment [Member]      
Financial instruments [Line Items]      
Payments for share issue costs $ 0 $ 57,290 $ 5,729
Interest payment [Member]      
Financial instruments [Line Items]      
Payments for share issue costs $ 0 $ 1,515 $ 3,275