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Debt | 9 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Debt | Debt Total debt consisted of the following:
| Interest rate |  | September 30, 2020 |  | December 31, 2019
Notes due October 2021 | 4.625% |  | $ | 170,253 |  |  | $ | 600,000 |
Notes due May 2022 | 5.375% |  | 148,792 |  |  | 400,000 |
Notes due April 2023 | 5.70% |  | 271,000 |  |  | 400,000 |
Notes due March 2024 | 4.625% |  | 374,000 |  |  | 500,000 |
Notes due January 2037 | 5.25% |  | 35,841 |  |  | 35,841 |
Notes due March 2043 | 6.70% |  | 425,000 |  |  | 425,000 |
Term loan due November 2024 | Variable |  | 385,000 |  |  | 400,000 |
Term loan due January 2025 | Variable |  | 828,750 |  |  | — |
Other debt |  |  | 5,000 |  |  | 5,108 |
Principal amount |  |  | 2,643,636 |  |  | 2,765,949 |
Less: unamortized costs, net |  |  | 48,415 |  |  | 26,227 |
Total debt |  |  | 2,595,221 |  |  | 2,739,722 |
Less: current portion long-term debt |  |  | 63,509 |  |  | 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.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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