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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2019 | Jun. 30, 2018 | Aug. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 1,689,670,000 | $ 1,746,145,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (8,769,000) | (12,720,000) |  |  |  |  |
Net Carrying Value | 1,680,901,000 | 1,733,425,000 |  |  |  |  |
Non-Recourse BPL Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | 1,182,594,000 | 1,079,353,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (1,676,000) | (2,153,000) |  |  |  |  |
Net Carrying Value | $ 1,180,918,000 | 1,077,200,000 |  |  |  |  |
Convertible notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings |  |  | $ 215,000,000 |  |  |  |
Convertible notes | SOFR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.51% |  |  |  |  |  |
Trust Preferred Securities and Subordinated Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 139,500,000 | 139,500,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (687,000) | (733,000) |  |  |  |  |
Net Carrying Value | 138,813,000 | $ 138,767,000 |  |  |  |  |
Trust Preferred Securities and Subordinated Notes | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.25% |  |  |  |  |
Trust preferred securities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net Carrying Value | 100,000,000 |  |  |  |  |  |
Facility A | Recourse Subordinate Securities Financing | Affiliated Entity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings |  | $ 130,408,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount |  | 0 |  |  |  |  |
Net Carrying Value |  | $ 130,408,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 5.71% |  |  |  |  |
Facility B | Recourse Subordinate Securities Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | 101,228,000 |  |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | 0 |  |  |  |  |  |
Net Carrying Value | $ 101,228,000 |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.71% |  |  |  |  |  |
Facility B | Recourse Subordinate Securities Financing | Affiliated Entity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings |  | $ 101,706,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount |  | (50,000) |  |  |  |  |
Net Carrying Value |  | $ 101,656,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 4.21% |  |  |  |  |
Facility C | Recourse Subordinate Securities Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 57,982,000 |  |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | 0 |  |  |  |  |  |
Net Carrying Value | $ 57,982,000 |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 4.75% |  |  |  |  |  |
Facility C | Recourse Subordinate Securities Financing | Affiliated Entity |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings |  | $ 68,995,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount |  | (125,000) |  |  |  |  |
Net Carrying Value |  | $ 68,870,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 4.75% |  |  |  |  |
Facility D | Non-Recourse BPL Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 481,465,000 | $ 404,622,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (194,000) | (667,000) |  |  |  |  |
Net Carrying Value | 481,271,000 | 403,955,000 |  |  |  |  |
Limit | $ 750,000,000 | $ 750,000,000 |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.94% |  |  |  |  |  |
Facility D | Non-Recourse BPL Financing | SOFR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.87% |  |  |  |  |
Facility E |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Limit | $ 335,000,000 |  |  |  |  |  |
Facility E | Non-Recourse BPL Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | 70,858,000 | $ 308,933,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (750,000) | (838,000) |  |  |  |  |
Net Carrying Value | 70,108,000 | 308,095,000 |  |  |  |  |
Limit | $ 100,000,000 | $ 335,000,000 |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.25% |  |  |  |  |  |
Facility E | Non-Recourse BPL Financing | SOFR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 3.25% |  |  |  |  |
Facility F | Non-Recourse BPL Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 40,827,000 | $ 64,689,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (86,000) | (473,000) |  |  |  |  |
Net Carrying Value | 40,741,000 | 64,216,000 |  |  |  |  |
Limit | $ 500,000,000 | $ 500,000,000 |  |  |  |  |
Facility F | Non-Recourse BPL Financing | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.35% |  |  |  |  |  |
Facility F | Non-Recourse BPL Financing | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.60% |  |  |  |  |  |
Facility F | Non-Recourse BPL Financing | SOFR | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.25% |  |  |  |  |
Facility F | Non-Recourse BPL Financing | SOFR | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 2.50% |  |  |  |  |
Facility H | Non-Recourse BPL Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 244,263,000 |  |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | 0 |  |  |  |  |  |
Net Carrying Value | 244,263,000 |  |  |  |  |  |
Limit | $ 450,000,000 |  |  |  |  |  |
Facility H | Non-Recourse BPL Financing | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.40% |  |  |  |  |  |
Facility H | Non-Recourse BPL Financing | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.60% |  |  |  |  |  |
Facility I | Non-Recourse BPL Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 176,986,000 |  |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | 0 |  |  |  |  |  |
Net Carrying Value | 176,986,000 |  |  |  |  |  |
Limit | $ 450,000,000 |  |  |  |  |  |
Facility I | Non-Recourse BPL Financing | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.25% |  |  |  |  |  |
Facility I | Non-Recourse BPL Financing | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.45% |  |  |  |  |  |
Facility J | Non-Recourse BPL Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 8,985,000 |  |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (646,000) |  |  |  |  |  |
Net Carrying Value | 8,339,000 |  |  |  |  |  |
Limit | $ 100,000,000 |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 5.00% |  |  |  |  |  |
5.75% exchangeable senior notes | Convertible notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 156,666,000 | $ 162,092,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (1,528,000) | (2,410,000) |  |  |  |  |
Net Carrying Value | $ 155,138,000 | $ 159,682,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.75% | 5.75% |  |  | 5.75% |  |
7.75% convertible senior notes | Convertible notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings | $ 210,910,000 | $ 215,000,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount | (4,878,000) | (6,142,000) |  |  |  |  |
Net Carrying Value | $ 206,032,000 | $ 208,858,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 7.75% | 7.75% |  |  |  |
5.625% exchangeable senior notes | Convertible notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings |  | $ 150,200,000 |  |  |  |  |
Unamortized Deferred Issuance Costs / Discount |  | (1,282,000) |  |  |  |  |
Net Carrying Value |  | $ 148,918,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.625% | 5.625% |  | 5.625% |  | 5.625% |
Convertible Senior Notes Due 2023 | Convertible notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 4.75% |  |  |  |  | 4.75%

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