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AVAILABLE-FOR-SALE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2017
AVAILABLE-FOR-SALE SECURITIES |
Schedule of 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 |

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