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AVAILABLE-FOR-SALE SECURITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
AVAILABLE-FOR-SALE SECURITIES
Cost	$ 142,546	$ 91,200
Accumulated impairment losses	(44,070)	(36,017)
Unrealized gains in accumulated other comprehensive income	24,669	37,634
Unrealized losses in accumulated other comprehensive income	(370)	(507)
Total estimated fair value of available-for-sale securities	122,775	92,310
Net proceeds from sale of available-for-sale securities	300	6,000
Gain on sale of available-for-sale securities before income taxes	168	$ 3,500
Impairment loss on available-for- sale securities	$ 8,532

X

- Definition

The amount of accumulated impairment losses on available-for-sale securities.

+ References

No definition available.

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- Definition

The amount of available-for-sale securities, at cost.

+ References

No definition available.

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X

- Definition

The amount of unrealized gains in accumulated other comprehensive income on available-for-sale securities.

+ References

No definition available.

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- Definition

The amount of unrealized loss in accumulated other comprehensive income on available-for-sale securities.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

The amount of current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Current financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B
-URIDate 2017-03-09

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- Definition

The gains (losses) on available-for-sale financial assets. [Refer: Financial assets available-for-sale]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 20
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- Definition

The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2017-01-01
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-Name IAS
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- Definition

The cash inflow from the disposal or maturity of available-for-sale financial assets. [Refer: Financial assets available-for-sale]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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