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AVAILABLE-FOR-SALE SECURITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 |

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- Definition The amount of accumulated impairment losses on available-for-sale securities. + References No definition available. + Details
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- Definition The amount of available-for-sale securities, at cost. + References No definition available. + Details
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- Definition The amount of unrealized gains in accumulated other comprehensive income on available-for-sale securities. + References No definition available. + Details
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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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- 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 + Details
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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 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_a_ii&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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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 -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_a&doctype=Standard -URIDate 2017-03-09 + Details
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