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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Borrowings $ 1,838,774,000 $ 1,746,145,000
Unamortized Deferred Issuance Costs / Discount (9,214,000) (12,720,000)
Net Carrying Value 1,829,560,000 1,733,425,000
Line of Credit    
Debt Instrument [Line Items]    
Borrowings 1,322,182,000 1,079,353,000
Unamortized Deferred Issuance Costs / Discount (1,449,000) (2,153,000)
Net Carrying Value 1,320,733,000 1,077,200,000
Trust preferred securities and subordinated notes    
Debt Instrument [Line Items]    
Borrowings 139,500,000 139,500,000
Unamortized Deferred Issuance Costs / Discount (698,000) (733,000)
Net Carrying Value $ 138,802,000 $ 138,767,000
Trust preferred securities and subordinated notes | SOFR    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.51%  
Trust preferred securities and subordinated notes | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent)   2.25%
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
Weighted Average Interest Rate (as a percent)   5.71%
Facility B | Recourse Subordinate Securities Financing | Affiliated Entity    
Debt Instrument [Line Items]    
Borrowings $ 101,247,000 $ 101,706,000
Unamortized Deferred Issuance Costs / Discount 0 (50,000)
Net Carrying Value $ 101,247,000 $ 101,656,000
Weighted Average Interest Rate (as a percent) 5.71% 4.21%
Facility C | Recourse Subordinate Securities Financing | Affiliated Entity    
Debt Instrument [Line Items]    
Borrowings $ 60,657,000 $ 68,995,000
Unamortized Deferred Issuance Costs / Discount 0 (125,000)
Net Carrying Value $ 60,657,000 $ 68,870,000
Weighted Average Interest Rate (as a percent) 4.75% 4.75%
Facility D | Line of Credit    
Debt Instrument [Line Items]    
Borrowings $ 486,099,000 $ 404,622,000
Unamortized Deferred Issuance Costs / Discount (596,000) (667,000)
Net Carrying Value 485,503,000 403,955,000
Limit $ 750,000,000 $ 750,000,000
Facility D | Line of Credit | SOFR    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.89% 2.87%
Facility E | Line of Credit    
Debt Instrument [Line Items]    
Borrowings $ 225,865,000 $ 308,933,000
Unamortized Deferred Issuance Costs / Discount (844,000) (838,000)
Net Carrying Value 225,021,000 308,095,000
Limit $ 335,000,000 $ 335,000,000
Facility E | Line of Credit | SOFR    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 3.25% 3.25%
Facility F | Line of Credit    
Debt Instrument [Line Items]    
Borrowings $ 21,293,000 $ 64,689,000
Unamortized Deferred Issuance Costs / Discount (9,000) (473,000)
Net Carrying Value 21,284,000 64,216,000
Limit $ 500,000,000 $ 500,000,000
Facility F | Line of Credit | SOFR | Minimum    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.35% 2.25%
Facility F | Line of Credit | SOFR | Maximum    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.60% 2.50%
Facility H | Line of Credit    
Debt Instrument [Line Items]    
Borrowings $ 234,014,000  
Unamortized Deferred Issuance Costs / Discount 0  
Net Carrying Value 234,014,000  
Limit $ 450,000,000  
Facility H | Line of Credit | SOFR | Minimum    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.40%  
Facility H | Line of Credit | SOFR | Maximum    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.60%  
Facility I | Line of Credit    
Debt Instrument [Line Items]    
Borrowings $ 193,007,000  
Unamortized Deferred Issuance Costs / Discount 0  
Net Carrying Value 193,007,000  
Limit $ 450,000,000  
Facility I | Line of Credit | SOFR | Minimum    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.25%  
Facility I | Line of Credit | SOFR | Maximum    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.77%  
5.625% convertible 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
Weighted Average Interest Rate (as a percent) 5.625% 5.625%
5.75% exchangeable senior notes | Convertible notes    
Debt Instrument [Line Items]    
Borrowings $ 162,092,000 $ 162,092,000
Unamortized Deferred Issuance Costs / Discount (1,793,000) (2,410,000)
Net Carrying Value $ 160,299,000 $ 159,682,000
Weighted Average Interest Rate (as a percent) 5.75% 5.75%
7.75% convertible senior notes | Convertible notes    
Debt Instrument [Line Items]    
Borrowings $ 215,000,000 $ 215,000,000
Unamortized Deferred Issuance Costs / Discount (5,274,000) (6,142,000)
Net Carrying Value $ 209,726,000 $ 208,858,000
Weighted Average Interest Rate (as a percent) 7.75% 7.75%