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Debt (Details) - USD ($) $ in Thousands, shares in Millions |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 18, 2020 | Aug. 20, 2020 | Aug. 12, 2020 | Jul. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020
2.75% Exchangeable Senior Debentures due 2050 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Carrying value |  |  |  |  | $ 588,064 | $ 608,804
Interest rate (as a percent) |  |  |  |  | 2.75% | 2.75%
1.25% Exchangeable Senior Debentures due 2050 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Carrying value |  |  |  |  | $ 811,536 | $ 836,971
Interest rate (as a percent) |  |  |  |  | 1.25% | 1.25%
1.75% Exchangeable Senior Debentures due 2046 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Carrying value |  |  |  |  | $ 24,741 | $ 26,350
Interest rate (as a percent) |  |  |  |  | 1.75% | 1.75%
Exchange of debentures based on share price exceeds on par value |  |  |  |  |  | 130.00%
Minimum number of days share price exceeds par value |  |  |  |  |  | 20 days
Number of trading days |  |  |  |  |  | 30 days
Exchange period |  |  |  |  |  | 1 year
Senior Credit Facility |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Carrying value |  |  |  |  | $ 523,000 | $ 704,000
SPV | Margin Loan Facility |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Maximum borrowing capacity including incremental facility |  |  | $ 2,300,000 |  |  |
Borrowings | $ 1,300,000 | $ 100,000 |  | $ 25,000 |  |
Carrying value |  |  |  |  | 2,000,000 | $ 2,000,000
Remaining borrowing capacity |  |  |  |  | $ 300,000 |
SPV | Margin Loan Facility | Charter |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Number of common shares pledged as collateral |  |  |  |  | 12.3 |
Value of pledged collateral |  |  |  |  | $ 7,600,000 |
SPV | Margin Loan Facility | Three-month LIBOR |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Interest rate basis |  |  | three-month LIBOR |  |  |
Basis spread on variable rate | 1.85% |  | 1.50% |  |  |

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