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Long-Term Debt - Schedule of Accrued Interest Payable on Long Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2019 | Jun. 30, 2018
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Total Accrued Interest Payable on Long-Term Debt | $ 10,248 | $ 11,966 |  |  |  |
Non-Recourse BPL Financing |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Accrued Interest Payable on Long-Term Debt | $ 5,502 | $ 3,364 |  |  |  |
Convertible notes | 5.625% exchangeable senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.625% | 5.625% |  | 5.625% |  | 5.625%
Total Accrued Interest Payable on Long-Term Debt | $ 0 | $ 3,896 |  |  |  |
Convertible notes | 5.75% exchangeable senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.75% | 5.75% |  |  | 5.75% |
Total Accrued Interest Payable on Long-Term Debt | $ 2,251 | $ 2,332 |  |  |  |
Convertible notes | 7.75% convertible senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 7.75% | 7.75% |  |  |
Total Accrued Interest Payable on Long-Term Debt | 566 | $ 741 |  |  |  |
Trust preferred securities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Accrued Interest Payable on Long-Term Debt | $ 1,929 | $ 1,633 |  |  |  |

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