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FINANCIAL INSTRUMENTS (Floating-to-fixed interest rate swap contracts outstanding) (Details) - Cash flow hedges - Interest rate risk $ in Thousands	Dec. 31, 2017 USD ($)
Disclosure of detailed information about hedging instruments [line items]
Notional amount	$ 250,000
Financial assets, carrying value	12,154
Floating-to-fixed interest rate swap, maturing on June 17, 2021
Disclosure of detailed information about hedging instruments [line items]
Notional amount	150,000
Financial assets, carrying value	5,617
Floating-to-fixed interest rate swap, maturing on August 25, 2023
Disclosure of detailed information about hedging instruments [line items]
Notional amount	50,000
Financial assets, carrying value	2,787
Floating-to-fixed interest rate swap, maturing on August 25, 2026
Disclosure of detailed information about hedging instruments [line items]
Notional amount	50,000
Financial assets, carrying value	$ 3,750
Fixed rate | Floating-to-fixed interest rate swap, maturing on June 17, 2021
Disclosure of detailed information about hedging instruments [line items]
Interest rate	0.96%
Fixed rate | Floating-to-fixed interest rate swap, maturing on August 25, 2023
Disclosure of detailed information about hedging instruments [line items]
Interest rate	1.18%
Fixed rate | Floating-to-fixed interest rate swap, maturing on August 25, 2026
Disclosure of detailed information about hedging instruments [line items]
Interest rate	1.34%

X

- Definition

The average rate of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 23B
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_23B_b&doctype=Standard
-URIDate 2017-03-09

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- Definition

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+ References

No definition available.

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- Definition

The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 24A
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24A_a&doctype=Standard
-URIDate 2017-03-09

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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