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OTHER RECEIVABLES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Trade and other receivables [abstract]    
Derivative financial instruments $ 3,700 $ 7,600
Tax receivables 1,200 1,300
Other 2,600 2,900
Balance as of 31 December $ 7,488 $ 11,787