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FINANCE LEASES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of recognised finance lease as assets by lessee [line items]
Current finance lease liabilities	$ 8,030	$ 8,030
Non-current finance lease liabilities	65,798	69,005
Finance lease liabilities	$ 73,828	77,035
Finance lease term	15 years
Finance lease amortisation period	15 years
PP&E
Disclosure of recognised finance lease as assets by lessee [line items]
Recognised finance lease as assets	$ 25,300	$ 61,400

X

- Definition

The amount of current finance lease liabilities. [Refer: Finance lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
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-URIDate 2017-03-09

+ Details

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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X

- Definition

The amount of liabilities related to finance leases.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_55&doctype=Standard&book=B
-URIDate 2017-03-09

+ Details

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X

- Definition

The amount of non-current finance lease liabilities. [Refer: Finance lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_55&doctype=Standard&book=B
-URIDate 2017-03-09

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X

- Definition

The amount of assets recognised by the entity, which are leased under finance leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 31
-Subparagraph a
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-URIDate 2017-03-09

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X

- Definition

Finance lease amortisation period

+ References

No definition available.

+ Details

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X

- Definition

Finance lease term

+ References

No definition available.

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