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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
 
As at
 
As at
 
June 30, 2019
 
December 31, 2018
 
$
 
$
Revolving Credit Facilities due through 2022
323,929

 
417,997

Term Loans due through 2021
273,996

 
323,995

Total principal
597,925

 
741,992

Less: unamortized discount and debt issuance costs
(4,699
)
 
(6,586
)
Total debt
593,226

 
735,406

Less: current portion
(101,264
)
 
(106,236
)
Non-current portion of long-term debt
491,962

 
629,170