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OTHER FINANCIAL LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current    
(a) Interest bearing loans $ 1,288,749 $ 1,814,647
(b) Hedge derivatives 12,200 24,881
Non-current    
(a) Interest bearing loans 6,602,891 6,790,273
(b) Hedge derivatives 2,617 6,679
Total non-current 6,605,508 6,796,952
Other Financial Liabilities [Member]    
Current    
(a) Interest bearing loans 1,288,749 1,814,647
(b) Hedge derivatives 12,200 24,881
Total current 1,300,949 1,839,528
Non-current    
(a) Interest bearing loans 6,602,891 6,790,273
(b) Hedge derivatives 2,617 6,679
Total non-current $ 6,605,508 $ 6,796,952