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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
As at September 30, 2018 and December 31, 2017, the Company’s accumulated other comprehensive income (loss) (or AOCI) consisted of the following components:
 
September 30,
 
December 31,
 
2018
 
2017
 
$
 
$
Unrealized gain on qualifying cash flow hedging instruments
6,007

 
1,409

Pension adjustments, net of tax recoveries
(2,426
)
 
(10,697
)
Foreign exchange gain on currency translation
4,138

 
3,293

 
7,719

 
(5,995
)