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OTHER FINANCIAL LIABILITIES (Details 6) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Miscellaneous liabilities [abstract]      
Debit (credit) recognized in comprehensive income during the period $ 18,344 $ 127,390 $ 80,387
Debit (credit) transferred from net equity to income during the period $ (15,000) $ (113,403) $ (151,244)