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AVAILABLE-FOR-SALE SECURITIES (Tables)
 12 Months Ended
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