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Senior Notes, Convertible Notes and Trust Preferred Securities - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2007
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Debt satisfaction gains (charges), net |  | $ 21,452,000 | $ (4,517,000) | $ (2,596,000) |
Senior Notes Due 2023 and 2024 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Prepayment of costs and fees | $ 9,531,000 |  |  |  |
Extinguishment of debt, accrued interest | 1,024,000 |  |  |  |
Debt satisfaction gains (charges), net | 10,119,000 |  |  |  |
Senior Notes Due 2023 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Extinguishment of debt | 61,244,000 |  |  |  |
Senior Notes Due 2024 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Extinguishment of debt | $ 51,068,000 |  |  |  |
Senior Notes |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face amount |  | 787,688,000 | 500,000,000 |  |
Debt instrument, unamortized discount |  | 3,491,000 | 963,000 |  |
Senior Notes | Senior Notes Due 2030 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face amount |  | $ 400,000,000 | 0 |  |
Interest Rate |  | 2.70% |  |  |
Issue price |  | 99.233% |  |  |
Debt instrument, unamortized discount |  | $ 3,068,000 |  |  |
Senior Notes | Senior Notes Due 2023 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face amount |  | $ 188,756,000 | 250,000,000 |  |
Interest Rate |  | 4.25% |  |  |
Issue price |  | 99.026% |  |  |
Senior Notes | Senior Notes Due 2024 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face amount |  | $ 198,932,000 | 250,000,000 |  |
Interest Rate |  | 4.40% |  |  |
Issue price |  | 99.883% |  |  |
6.804% Trust Preferred Securities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 200,000,000
Interest Rate |  | 1.914% |  |  | 6.804%
Principal amount outstanding on Trust Preferred Securities |  | $ 129,120,000 | 129,120,000 |  |
Debt issuance costs, gross |  | $ 1,625,000 | $ 1,724,000 |  |
6.804% Trust Preferred Securities | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.70%

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