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Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Components of Long-Term Debt
September 30, 2021December 31, 2020
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U.S. Dollar-denominated Revolving Credit Facilities due in 2022105,000100,000
U.S. Dollar-denominated Term Loans and Bonds due from 2021 to 2030812,304873,712
Norwegian Krone-denominated Bonds due from 2021 to 2025348,630355,514
Euro-denominated Term Loans due in 2023 and 2024 128,439152,710
    Total principal1,394,3731,481,936
Unamortized discount and debt issuance costs(8,681)(9,723)
    Total debt1,385,6921,472,213
Less current portion(350,372)(250,508)
    Long-term debt1,035,3201,221,705