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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
September 30, 2021December 31, 2020
$$
Revolving Credit Facilities due through 2024431,167285,000
Senior Notes (9.25%) due November 15, 2022
243,395243,395
Convertible Senior Notes (5%) due January 17, 2023
112,184112,184
Norwegian Krone-denominated Bonds due through September 2025348,630355,514
U.S. Dollar-denominated Term Loans due through 2030868,450938,280
Euro-denominated Term Loans due through 2024128,439152,710
Total principal2,132,2652,087,083
Less unamortized discount and debt issuance costs(19,086)(31,976)
Total debt2,113,1792,055,107
Less current portion(384,771)(261,366)
Long-term portion1,728,4081,793,741