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Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
 
As at
 
As at
 
September 30, 2019
 
December 31, 2018
 
$
 
$
Revolving Credit Facilities due through 2022
363,930

 
417,997

Term Loans due through 2021
248,947

 
323,995

Total principal
612,877

 
741,992

Less: unamortized discount and debt issuance costs
(3,917
)
 
(6,586
)
Total debt
608,960

 
735,406

Less: current portion
(101,295
)
 
(106,236
)
Non-current portion of long-term debt
507,665

 
629,170