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Financial results, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finance income:      
Interest income $ 11,230 $ 7,671 $ 8,201
Other income 514 286 949
Finance income 11,744 7,957 9,150
Finance costs:      
Interest expense (52,308) (48,198) (49,491)
Cash flow hedge - transfer from equity (20,758) (85,214) (32,700)
Foreign exchange losses, net (38,708) (19,062) (23,423)
Taxes (3,705) (2,719) (3,358)
Loss from interest rate/foreign exchange rate derivative financial instruments 2,163 5,694 4,437
Borrowing costs recognised as expense (10,847) 0 0
Other expenses (2,860) (4,493) (3,481)
Finance costs 131,349 165,380 116,890
Financial results, net $ (119,605) $ (157,423) $ (107,740)