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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
December 31, 2020
$		December 31, 2019
$
Revolving Credit Facilities 285,000 603,132 
Senior Notes (8.5%) due January 15, 2020
— 36,712 
Senior Notes (9.25%) due November 15, 2022
243,395 250,000 
Convertible Senior Notes (5%) due January 15, 2023
112,184 125,000 
Norwegian Krone-denominated Bonds due through September 2025355,514 347,163 
U.S. Dollar-denominated Term Loans due through 2030938,280 1,336,437 
Euro-denominated Term Loans due through 2024152,710 165,376 
Other U.S. Dollar-denominated loan— 3,300 
Total principal2,087,083 2,867,120 
Less unamortized discount and debt issuance costs(31,976)(39,968)
Total debt2,055,107 2,827,152 
Less current portion(261,366)(523,312)
Long-term portion1,793,741 2,303,840