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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%