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AVAILABLE-FOR-SALE SECURITIES | 12 Months Ended
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Dec. 31, 2017
AVAILABLE-FOR-SALE SECURITIES |
AVAILABLE-FOR-SALE SECURITIES | 8. AVAILABLE-FOR-SALE SECURITIES
|  |  | As at December 31, 2017 |  |  | As at December 31, 2016 |
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 |
During the year ended December 31, 2017, the Company received net proceeds of $0.3 million (2016 – $6.0 million) and recognized a gain before income taxes of $0.2 million (2016 – $3.5 million) on the sale of certain available-for-sale securities. During the year ended December 31, 2017, the Company recorded an impairment loss of $8.5 million (2016 – nil) on certain available-for-sale securities that were determined to have an impairment that was significant or prolonged.

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- Definition The disclosure of financial assets classified as available for sale. [Refer: Financial assets available-for-sale] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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