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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Borrowings | $ 1,972,863,000 | $ 1,650,576,000
Unamortized Deferred Issuance Costs / Discount | (9,159,000) | (9,743,000)
Net Carrying Value | 1,963,704,000 | 1,640,833,000
Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | 1,312,442,000 | 990,155,000
Unamortized Deferred Issuance Costs / Discount | (1,759,000) | (1,672,000)
Net Carrying Value | 1,310,683,000 | 988,483,000
Trust preferred securities and subordinated notes |  |
Debt Instrument [Line Items] |  |
Borrowings | 139,500,000 | 139,500,000
Unamortized Deferred Issuance Costs / Discount | (768,000) | (779,000)
Net Carrying Value | $ 138,732,000 | $ 138,721,000
Trust preferred securities and subordinated notes | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% | 2.25%
Facility A | Recourse Subordinate Securities Financing | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 133,034,000 | $ 144,385,000
Unamortized Deferred Issuance Costs / Discount | (208,000) | (313,000)
Net Carrying Value | $ 132,826,000 | $ 144,072,000
Weighted Average Interest Rate (as a percent) | 4.21% | 4.21%
Facility B | Recourse Subordinate Securities Financing | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 102,351,000 | $ 102,351,000
Unamortized Deferred Issuance Costs / Discount | (278,000) | (353,000)
Net Carrying Value | $ 102,073,000 | $ 101,998,000
Weighted Average Interest Rate (as a percent) | 4.21% | 4.21%
Facility G | Recourse Subordinate Securities Financing | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 81,995,000 | $ 91,707,000
Unamortized Deferred Issuance Costs / Discount | (313,000) | (376,000)
Net Carrying Value | $ 81,682,000 | $ 91,331,000
Weighted Average Interest Rate (as a percent) | 4.75% | 4.75%
Non-Recourse BPL Financing, Facility D | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 430,026,000 | $ 307,215,000
Unamortized Deferred Issuance Costs / Discount | (755,000) | (507,000)
Net Carrying Value | 429,271,000 | 306,708,000
Limit | $ 600,000,000 | $ 400,000,000
Non-Recourse BPL Financing, Facility D | Facilities | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.50% | 2.75%
Recourse BPL Financing, Facility E | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 301,200,000 | $ 234,349,000
Unamortized Deferred Issuance Costs / Discount | (205,000) | (123,000)
Net Carrying Value | 300,995,000 | 234,226,000
Limit | $ 450,000,000 | $ 450,000,000
Recourse BPL Financing, Facility E | Facilities | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% | 2.21%
Recourse BPL Financing, Facility I | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 263,836,000 | $ 110,148,000
Unamortized Deferred Issuance Costs / Discount | 0 | 0
Net Carrying Value | 263,836,000 | 110,148,000
Limit | $ 450,000,000 | $ 450,000,000
Recourse BPL Financing, Facility I | Facilities | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.24% | 3.35%
4.75% convertible senior notes | Convertible notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 198,629,000 | $ 198,629,000
Unamortized Deferred Issuance Costs / Discount | (1,571,000) | (1,836,000)
Net Carrying Value | $ 197,058,000 | $ 196,793,000
Weighted Average Interest Rate (as a percent) | 4.75% | 4.75%
5.625% convertible senior notes | Convertible notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 150,200,000 | $ 150,200,000
Unamortized Deferred Issuance Costs / Discount | (1,879,000) | (2,072,000)
Net Carrying Value | $ 148,321,000 | $ 148,128,000
Weighted Average Interest Rate (as a percent) | 5.625% | 5.625%
5.75% exchangeable senior notes | Convertible notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 172,092,000 | $ 172,092,000
Unamortized Deferred Issuance Costs / Discount | (3,182,000) | (3,384,000)
Net Carrying Value | $ 168,910,000 | $ 168,708,000
Weighted Average Interest Rate (as a percent) | 5.75% | 5.75%

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