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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Aug. 31, 2022	Jun. 30, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Borrowings	$ 1,546,934,000	$ 1,650,576,000
Unamortized Deferred Issuance Costs / Discount	(12,708,000)	(9,743,000)
Net Carrying Value	1,534,226,000	1,640,833,000
Facilities
Debt Instrument [Line Items]
Borrowings	870,142,000	990,155,000
Unamortized Deferred Issuance Costs / Discount	(1,291,000)	(1,672,000)
Net Carrying Value	868,851,000	988,483,000
Convertible notes
Debt Instrument [Line Items]
Unamortized Deferred Issuance Costs / Discount			$ (1,000,000)
Trust preferred securities and subordinated notes
Debt Instrument [Line Items]
Borrowings	139,500,000	139,500,000
Unamortized Deferred Issuance Costs / Discount	(745,000)	(779,000)
Net Carrying Value	$ 138,755,000	$ 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
Debt Instrument [Line Items]
Borrowings	$ 131,316,000	$ 144,385,000
Unamortized Deferred Issuance Costs / Discount	0	(313,000)
Net Carrying Value	$ 131,316,000	$ 144,072,000
Weighted Average Interest Rate (as a percent)	4.21%	4.21%
Facility B | Recourse Subordinate Securities Financing
Debt Instrument [Line Items]
Borrowings	$ 102,006,000	$ 102,351,000
Unamortized Deferred Issuance Costs / Discount	(126,000)	(353,000)
Net Carrying Value	$ 101,880,000	$ 101,998,000
Weighted Average Interest Rate (as a percent)	4.21%	4.21%
Facility C | Recourse Subordinate Securities Financing
Debt Instrument [Line Items]
Borrowings	$ 71,792,000	$ 91,707,000
Unamortized Deferred Issuance Costs / Discount	(189,000)	(376,000)
Net Carrying Value	$ 71,603,000	$ 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	$ 565,028,000	$ 307,215,000
Unamortized Deferred Issuance Costs / Discount	(976,000)	(507,000)
Net Carrying Value	564,052,000	306,708,000
Limit	$ 750,000,000	$ 400,000,000			$ 600,000,000
Non-Recourse BPL Financing, Facility D | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.51%	2.75%
Recourse BPL Financing, Facility J | Facilities
Debt Instrument [Line Items]
Borrowings	$ 0
Unamortized Deferred Issuance Costs / Discount	0
Net Carrying Value	0
Limit	$ 500,000,000
Recourse BPL Financing, Facility J | Facilities | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Recourse BPL Financing, Facility J | Facilities | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
Recourse BPL Financing, Facility E | Facilities
Debt Instrument [Line Items]
Borrowings		$ 234,349,000
Unamortized Deferred Issuance Costs / Discount		(123,000)
Net Carrying Value		234,226,000
Limit		$ 450,000,000
Recourse BPL Financing, Facility E | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		2.21%
Recourse BPL Financing, Facility F | Facilities
Debt Instrument [Line Items]
Borrowings		$ 110,148,000
Unamortized Deferred Issuance Costs / Discount		0
Net Carrying Value		110,148,000
Limit		$ 450,000,000
Recourse BPL Financing, Facility F | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		3.35%
4.75% convertible senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 199,000,000	$ 198,629,000
Unamortized Deferred Issuance Costs / Discount		(1,836,000)
Net Carrying Value		$ 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	(1,484,000)	(2,072,000)
Net Carrying Value	$ 148,716,000	$ 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	(2,769,000)	(3,384,000)
Net Carrying Value	$ 169,323,000	$ 168,708,000
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
Unamortized Deferred Issuance Costs / Discount	$ (6,419,000)
Net Carrying Value	$ 208,581,000
Weighted Average Interest Rate (as a percent)	7.75%

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