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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
December 31, 2021
$
December 31, 2020
$
Revolving Credit Facilities due through December 2024271,167185,000
Senior Notes (9.25%) due November 2022
243,395243,395
Convertible Senior Notes (5%) due January 2023
112,184112,184
U.S. Dollar-denominated Term Loan due through August 202353,33964,568
Total principal680,085605,147
Less: unamortized discount and debt issuance costs(8,605)(22,253)
Total debt671,480582,894
Less: current portion(255,306)(10,858)
Long-term portion416,174572,036