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DEBT AND CREDIT FACILITY - Disclosure of Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments [Abstract]    
Balance, beginning of year $ 236,358 $ 223,211
Accretion of discount 14,371 13,147
Interest accrued in period 7,619 7,619
Interest paid (7,619) (7,619)
Balance, end of year 250,729 236,358
Accrued interest outstanding (note 12) (3,178) (3,178)
Non-current portion of Notes outstanding $ 247,551 $ 233,180