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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2021 USD ($)
Debt Instrument [Line Items]
Borrowings	$ 1,495,520
Unamortized Deferred Issuance Costs / Discount	(11,212)
Net Carrying Value	1,484,308
Facilities
Debt Instrument [Line Items]
Borrowings	835,099
Unamortized Deferred Issuance Costs / Discount	(1,827)
Net Carrying Value	833,272
Trust preferred securities and subordinated notes
Debt Instrument [Line Items]
Borrowings	139,500
Unamortized Deferred Issuance Costs / Discount	(803)
Net Carrying Value	$ 138,697
Trust preferred securities and subordinated notes | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Non-Recourse Business Purpose Loans
Debt Instrument [Line Items]
Repayments of debt	$ 242,000
Sequoia | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings	160,102
Unamortized Deferred Issuance Costs / Discount	(521)
Net Carrying Value	$ 159,581
Weighted Average Interest Rate (as a percent)	4.21%
CAFL | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings	$ 102,424
Unamortized Deferred Issuance Costs / Discount	(505)
Net Carrying Value	$ 101,919
Weighted Average Interest Rate (as a percent)	4.21%
Non-Recourse BPL Financing, Facility A | Facilities
Debt Instrument [Line Items]
Borrowings	$ 45,582
Unamortized Deferred Issuance Costs / Discount	(444)
Net Carrying Value	45,138
Limit	$ 45,582
Non-Recourse BPL Financing, Facility A | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.85%
Non-Recourse BPL Financing, Facility B | Facilities
Debt Instrument [Line Items]
Borrowings	$ 57,616
Unamortized Deferred Issuance Costs / Discount	(199)
Net Carrying Value	57,417
Limit	$ 250,000
Non-Recourse BPL Financing, Facility B | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Recourse BPL Financing, Facility C | Facilities
Debt Instrument [Line Items]
Borrowings	$ 269,100
Unamortized Deferred Issuance Costs / Discount	0
Net Carrying Value	269,100
Limit	$ 450,000
Recourse BPL Financing, Facility C | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.40%
Recourse BPL Financing, Facility D | Facilities
Debt Instrument [Line Items]
Borrowings	$ 200,275
Unamortized Deferred Issuance Costs / Discount	(158)
Net Carrying Value	200,117
Limit	$ 250,000
Recourse BPL Financing, Facility D | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
4.75% convertible senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 198,629
Unamortized Deferred Issuance Costs / Discount	(2,356)
Net Carrying Value	$ 196,273
Weighted Average Interest Rate (as a percent)	4.75%
5.625% convertible senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 150,200
Unamortized Deferred Issuance Costs / Discount	(2,450)
Net Carrying Value	$ 147,750
Weighted Average Interest Rate (as a percent)	5.625%
5.75% exchangeable senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 172,092
Unamortized Deferred Issuance Costs / Discount	(3,776)
Net Carrying Value	$ 168,316
Weighted Average Interest Rate (as a percent)	5.75%

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