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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2019
Jun. 30, 2018
Aug. 31, 2017
Debt Instrument [Line Items]              
Borrowings $ 1,689,670,000 $ 1,746,145,000          
Unamortized Deferred Issuance Costs / Discount (8,769,000) (12,720,000)          
Net Carrying Value 1,680,901,000 1,733,425,000          
Non-Recourse BPL Financing              
Debt Instrument [Line Items]              
Borrowings 1,182,594,000 1,079,353,000          
Unamortized Deferred Issuance Costs / Discount (1,676,000) (2,153,000)          
Net Carrying Value $ 1,180,918,000 1,077,200,000          
Convertible notes              
Debt Instrument [Line Items]              
Borrowings     $ 215,000,000        
Convertible notes | SOFR              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 2.51%            
Trust Preferred Securities and Subordinated Notes              
Debt Instrument [Line Items]              
Borrowings $ 139,500,000 139,500,000          
Unamortized Deferred Issuance Costs / Discount (687,000) (733,000)          
Net Carrying Value 138,813,000 $ 138,767,000          
Trust Preferred Securities and Subordinated Notes | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   2.25%          
Trust preferred securities              
Debt Instrument [Line Items]              
Net Carrying Value 100,000,000            
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          
Debt instrument, interest rate (as a percent)   5.71%          
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            
Debt instrument, interest rate (as a percent) 5.71%            
Facility B | Recourse Subordinate Securities Financing | Affiliated Entity              
Debt Instrument [Line Items]              
Borrowings   $ 101,706,000          
Unamortized Deferred Issuance Costs / Discount   (50,000)          
Net Carrying Value   $ 101,656,000          
Debt instrument, interest rate (as a percent)   4.21%          
Facility C | Recourse Subordinate Securities Financing              
Debt Instrument [Line Items]              
Borrowings $ 57,982,000            
Unamortized Deferred Issuance Costs / Discount 0            
Net Carrying Value $ 57,982,000            
Debt instrument, interest rate (as a percent) 4.75%            
Facility C | Recourse Subordinate Securities Financing | Affiliated Entity              
Debt Instrument [Line Items]              
Borrowings   $ 68,995,000          
Unamortized Deferred Issuance Costs / Discount   (125,000)          
Net Carrying Value   $ 68,870,000          
Debt instrument, interest rate (as a percent)   4.75%          
Facility D | Non-Recourse BPL Financing              
Debt Instrument [Line Items]              
Borrowings $ 481,465,000 $ 404,622,000          
Unamortized Deferred Issuance Costs / Discount (194,000) (667,000)          
Net Carrying Value 481,271,000 403,955,000          
Limit $ 750,000,000 $ 750,000,000          
Basis spread on variable rate (as a percent) 2.94%            
Facility D | Non-Recourse BPL Financing | SOFR              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   2.87%          
Facility E              
Debt Instrument [Line Items]              
Limit $ 335,000,000            
Facility E | Non-Recourse BPL Financing              
Debt Instrument [Line Items]              
Borrowings 70,858,000 $ 308,933,000          
Unamortized Deferred Issuance Costs / Discount (750,000) (838,000)          
Net Carrying Value 70,108,000 308,095,000          
Limit $ 100,000,000 $ 335,000,000          
Basis spread on variable rate (as a percent) 3.25%            
Facility E | Non-Recourse BPL Financing | SOFR              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   3.25%          
Facility F | Non-Recourse BPL Financing              
Debt Instrument [Line Items]              
Borrowings $ 40,827,000 $ 64,689,000          
Unamortized Deferred Issuance Costs / Discount (86,000) (473,000)          
Net Carrying Value 40,741,000 64,216,000          
Limit $ 500,000,000 $ 500,000,000          
Facility F | Non-Recourse BPL Financing | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 2.35%            
Facility F | Non-Recourse BPL Financing | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 2.60%            
Facility F | Non-Recourse BPL Financing | SOFR | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   2.25%          
Facility F | Non-Recourse BPL Financing | SOFR | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   2.50%          
Facility H | Non-Recourse BPL Financing              
Debt Instrument [Line Items]              
Borrowings $ 244,263,000            
Unamortized Deferred Issuance Costs / Discount 0            
Net Carrying Value 244,263,000            
Limit $ 450,000,000            
Facility H | Non-Recourse BPL Financing | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 2.40%            
Facility H | Non-Recourse BPL Financing | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 2.60%            
Facility I | Non-Recourse BPL Financing              
Debt Instrument [Line Items]              
Borrowings $ 176,986,000            
Unamortized Deferred Issuance Costs / Discount 0            
Net Carrying Value 176,986,000            
Limit $ 450,000,000            
Facility I | Non-Recourse BPL Financing | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 2.25%            
Facility I | Non-Recourse BPL Financing | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 2.45%            
Facility J | Non-Recourse BPL Financing              
Debt Instrument [Line Items]              
Borrowings $ 8,985,000            
Unamortized Deferred Issuance Costs / Discount (646,000)            
Net Carrying Value 8,339,000            
Limit $ 100,000,000            
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 $ 162,092,000          
Unamortized Deferred Issuance Costs / Discount (1,528,000) (2,410,000)          
Net Carrying Value $ 155,138,000 $ 159,682,000          
Debt instrument, interest rate (as a percent) 5.75% 5.75%     5.75%    
7.75% convertible senior notes | Convertible notes              
Debt Instrument [Line Items]              
Borrowings $ 210,910,000 $ 215,000,000          
Unamortized Deferred Issuance Costs / Discount (4,878,000) (6,142,000)          
Net Carrying Value $ 206,032,000 $ 208,858,000          
Debt instrument, interest rate (as a percent)   7.75% 7.75%        
5.625% exchangeable 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          
Debt instrument, interest rate (as a percent) 5.625% 5.625%   5.625%   5.625%  
Convertible Senior Notes Due 2023 | Convertible notes              
Debt Instrument [Line Items]              
Debt instrument, interest rate (as a percent)   4.75%         4.75%