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OTHER RECEIVABLES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Trade and other receivables [abstract]    
Partners and commercial managements $ 0 $ 500
Derivative financial instruments 7,600 3,300
Tax receivables 1,300 1,100
Other 2,900 3,200
Other receivables (Note 11) $ 11,787 $ 8,134