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BORROWINGS (Current and non-current information on borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Borrowings [abstract]    
Bank borrowings, undiscounted cash flows, non-current $ 1,724,454 $ 398,851
Debt instruments issued, non-current (8,117) (2,109)
Non-current borrowings 1,716,337 396,742
Bank borrowings, undiscounted cash flows, current 1,510,820 823,563
Debt instruments issued, current (5,250) (1,670)
Current borrowings 1,505,570 821,893
Total Borrowings $ 3,221,907 $ 1,218,635