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OTHER LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure For Other Liabilities [Abstract]    
Partners and commercial managements $ 1,200 $ 1,400
Accrued operating expenses 9,100 8,500
Accrued interest 4,600 5,200
Wages and social expenses 16,100 16,300
Derivative financial instruments 3,400 0
Payables to joint ventures 100 100
Other 2,000 2,300
Balance as of 31 December $ 36,503 $ 33,822