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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |
Borrowings | $ 1,716,875,000 | $ 1,689,670,000
Unamortized Deferred Issuance Costs / Discount | (9,737,000) | (8,769,000)
Net Carrying Value | 1,707,138,000 | 1,680,901,000
Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | 1,153,299,000 | 1,182,594,000
Unamortized Deferred Issuance Costs / Discount | (824,000) | (1,676,000)
Net Carrying Value | 1,152,475,000 | 1,180,918,000
Trust preferred securities and subordinated notes |  |
Debt Instrument [Line Items] |  |
Borrowings | 139,500,000 | 139,500,000
Unamortized Deferred Issuance Costs / Discount | (675,000) | (687,000)
Net Carrying Value | $ 138,825,000 | $ 138,813,000
Trust preferred securities and subordinated notes | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.51% | 2.51%
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
Weighted Average Interest Rate (as a percent) |  | 5.71%
Facility C | Recourse Subordinate Securities Financing |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 55,526,000 | $ 57,982,000
Unamortized Deferred Issuance Costs / Discount | 0 | 0
Net Carrying Value | $ 55,526,000 | $ 57,982,000
Weighted Average Interest Rate (as a percent) | 5.00% | 4.75%
Facility D | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 475,072,000 | $ 481,465,000
Unamortized Deferred Issuance Costs / Discount | 0 | (194,000)
Net Carrying Value | 475,072,000 | 481,271,000
Limit | $ 750,000,000 | $ 750,000,000
Facility D | Facilities | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.76% | 2.94%
Facility E | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings |  | $ 70,858,000
Unamortized Deferred Issuance Costs / Discount |  | (750,000)
Net Carrying Value |  | 70,108,000
Limit |  | $ 100,000,000
Facility E | Facilities | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) |  | 3.25%
Facility F | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 0 | $ 40,827,000
Unamortized Deferred Issuance Costs / Discount | 0 | (86,000)
Net Carrying Value | 0 | 40,741,000
Limit | $ 500,000,000 | $ 500,000,000
Facility F | Facilities | SOFR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.60% | 2.60%
Facility F | Facilities | SOFR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.25% | 2.35%
Facility H | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 368,363,000 | $ 244,263,000
Unamortized Deferred Issuance Costs / Discount | 0 | 0
Net Carrying Value | 368,363,000 | 244,263,000
Limit | $ 450,000,000 | $ 450,000,000
Facility H | Facilities | SOFR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.60% | 2.60%
Facility H | Facilities | SOFR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.25% | 2.40%
Facility I | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 228,970,000 | $ 176,986,000
Unamortized Deferred Issuance Costs / Discount | 0 | 0
Net Carrying Value | 228,970,000 | 176,986,000
Limit | $ 450,000,000 | $ 450,000,000
Facility I | Facilities | SOFR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.45% | 2.45%
Facility I | Facilities | SOFR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.25% | 2.25%
Facility J | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 25,368,000 | $ 8,985,000
Unamortized Deferred Issuance Costs / Discount | (824,000) | (646,000)
Net Carrying Value | 24,544,000 | 8,339,000
Limit | $ 100,000,000 | $ 100,000,000
Facility J | Facilities | AMERIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 5.00% | 5.00%
Facility K | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 0 |
Unamortized Deferred Issuance Costs / Discount | 0 |
Net Carrying Value | 0 |
Limit | $ 200,000,000 |
Facility K | Facilities | SOFR |  |
Debt Instrument [Line Items] |  |
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 | $ 156,666,000
Unamortized Deferred Issuance Costs / Discount | (1,320,000) | (1,528,000)
Net Carrying Value | $ 155,346,000 | $ 155,138,000
Weighted Average Interest Rate (as a percent) | 5.75% | 5.75%
7.75% convertible senior notes | Convertible notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 207,410,000 | $ 210,910,000
Unamortized Deferred Issuance Costs / Discount | (4,499,000) | (4,878,000)
Net Carrying Value | $ 202,911,000 | $ 206,032,000
Weighted Average Interest Rate (as a percent) | 7.75% | 7.75%
9.125% Senior Notes Due 2029 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 60,000,000 |
Unamortized Deferred Issuance Costs / Discount | (2,419,000) |
Net Carrying Value | $ 57,581,000 |
Weighted Average Interest Rate (as a percent) | 9.13% |

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