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EXCHANGEABLE NOTES (Schedule of Carrying Value of Exchangeable Notes) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Borrowings [abstract]      
Exchangeable senior notes $ 81,382 $ 92,955 $ 92,232
Total value of embedded derivatives - liability 238 2,230  
Total non-current liabilities $ 81,620 $ 95,185