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BORROWINGS (Current and non-current information on borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Borrowings [abstract]    
Bank borrowings, undiscounted cash flows, non-current $ 1,334,369 $ 1,639,604
Less: debt issue costs, non-current (7,080) (10,712)
Non-current borrowings 1,327,289 1,628,892
Bank borrowings, undiscounted cash flows, current 399,249 564,497
Less: debt issue costs, current (3,645) (4,715)
Current borrowings 395,604 559,782
Total Borrowings $ 1,722,893 $ 2,188,674