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DEBT AND CREDIT FACILITY - Disclosure of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financial Instruments [Abstract]
Balance, beginning of year	$ 223,211	$ 211,242
Accretion of discount	13,147	11,969
Interest accrued in period	7,619	7,619
Interest paid	(7,619)	(7,619)
Balance, end of year	236,358	223,211
Accrued interest outstanding (note 12)	(3,178)	(3,157)
Non-current portion of Notes outstanding	$ 233,180	$ 220,054

X

- Definition

The amount of current interest payable. [Refer: Interest payable]

+ References

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X

- Definition

The amount of instruments representing indebtedness held by the entity.

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- Definition

The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

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- Definition

Accretion of Discount

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Financial Instruments [Abstract]

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- Definition

Interest paid, debt

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