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BORROWINGS (Current and non-current information on borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Borrowings [abstract]    
Bank borrowings, undiscounted cash flows, non-current $ 1,648,124 $ 1,724,454
Less: debt issue costs, non-current (11,023) (8,117)
Non-current borrowings 1,637,101 1,716,337
Bank borrowings, undiscounted cash flows, current 404,390 1,510,820
Less: debt issue costs, current (4,534) (5,250)
Current borrowings 399,856 1,505,570
Total Borrowings $ 2,036,957 $ 3,221,907