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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
As at June 30, 2019 and December 31, 2018, the Company’s accumulated other comprehensive loss (or AOCI) consisted of the following components:
 
June 30,
 
December 31,
 
2019
 
2018
 
$
 
$
Unrealized (loss) gain on qualifying cash flow hedging instruments
(17,801
)
 
903

Pension adjustments, net of tax recoveries
(3,342
)
 
(3,176
)
 
(21,143
)
 
(2,273
)