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AVAILABLE-FOR-SALE SECURITIES
 12 Months Ended
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.