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OTHER LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure For Other Liabilities [Abstract]    
Partners and commercial managements $ 1,400 $ 2,000
Accrued operating expenses 8,500 5,200
Accrued interest 5,200 5,800
Wages and social expenses 16,300 14,600
Derivative financial instruments 0 4,800
Payables to joint ventures 100 100
Other 2,300 500
Balance as of 31 December $ 33,822 $ 33,055