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Debt
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Debt Debt
Total debt consisted of the following:


Interest rateSeptember 30, 2020December 31, 2019
Notes due October 20214.625%$170,253 $600,000 
Notes due May 20225.375%148,792 400,000 
Notes due April 20235.70%271,000 400,000 
Notes due March 20244.625%374,000 500,000 
Notes due January 20375.25%35,841 35,841 
Notes due March 20436.70%425,000 425,000 
Term loan due November 2024Variable385,000 400,000 
Term loan due January 2025Variable828,750 — 
Other debt5,000 5,108 
Principal amount2,643,636 2,765,949 
Less: unamortized costs, net48,415 26,227 
Total debt2,595,221 2,739,722 
Less: current portion long-term debt63,509 20,108 
Long-term debt$2,531,712 $2,719,614 

Interest rates on certain notes are subject to adjustment based on changes in our credit ratings. As a result of credit rating downgrades in November 2019 and May 2020, the interest rates on the October 2021 notes and April 2023 notes increased 0.50% and the interest rate on the May 2022 notes increased 0.75% in the second quarter of 2020. Further, the interest rates on the October 2021 notes and April 2023 notes will increase an additional 0.25% in the fourth quarter of 2020.
In February 2020, we secured a five-year $850 million term loan maturing January 2025 (the 2025 Term Loan). The 2025 Term Loan bears interest at LIBOR plus 5.5% and resets monthly. We have interest rate swap agreements with an aggregate notional amount of $500 million to mitigate the interest rate risk associated with $500 million of our variable-rate term loans. Under the terms of the swap agreements, we pay fixed-rate interest of 0.4443% and receive variable-rate interest based on one-month LIBOR. The variable interest rate under the term loans and the swaps reset monthly.
In March 2020, we purchased under a tender offer $428 million of the October 2021 notes, $250 million of the May 2022 notes, $125 million of the April 2023 notes and $125 million of the March 2024 notes. A $37 million loss was incurred on the early redemption of debt.
During the first nine months of 2020, we repaid $36 million of principal related to our term loans.
We have a $500 million secured revolving credit facility that expires in November 2024 and contains financial and non-financial covenants. At September 30, 2020, we were in compliance with all covenants. In September 2020, we repaid the $100 million under the credit facility that we drew down in April 2020. At September 30, 2020 and December 31, 2019, there were no outstanding borrowings under this facility.