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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
June 30, 2021December 31, 2020
$$
Revolving Credit Facilities due through 2024355,000285,000
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 2025354,486355,514
U.S. Dollar-denominated Term Loans due through 2030892,249938,280
Euro-denominated Term Loans due through 2024134,447152,710
Total principal2,091,7612,087,083
Less unamortized discount and debt issuance costs(23,042)(31,976)
Total debt2,068,7192,055,107
Less current portion(374,960)(261,366)
Long-term portion1,693,7591,793,741