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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
As at September 30, 2017 and December 31, 2016, the Company’s accumulated other comprehensive loss (or AOCI) consisted of the following components:
 
 
September 30,
 
December 31,
 
2017
 
2016
 
$
 
$
Unrealized loss on qualifying cash flow hedging instruments
398

 
(41
)
Pension adjustments, net of tax recoveries
(12,332
)
 
(12,160
)
Unrealized gain (loss) on marketable securities
22

 
(416
)
Foreign exchange gain on currency translation
2,683

 
2,014

 
(9,229
)
 
(10,603
)