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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%