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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Borrowings	$ 1,451,713
Unamortized Deferred Issuance Costs / Discount	(13,451)
Net Carrying Value	1,438,262
Facilities
Debt Instrument [Line Items]
Borrowings	790,292
Unamortized Deferred Issuance Costs / Discount	(3,423)
Net Carrying Value	786,869
Trust preferred securities and subordinated notes
Debt Instrument [Line Items]
Borrowings	139,500
Unamortized Deferred Issuance Costs / Discount	(814)
Net Carrying Value	$ 138,686
Trust preferred securities and subordinated notes | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Sequoia | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings	$ 172,805
Unamortized Deferred Issuance Costs / Discount	(624)
Net Carrying Value	$ 172,181
Weighted Average Interest Rate (as a percent)	4.21%
CAFL | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings	$ 102,426
Unamortized Deferred Issuance Costs / Discount	(581)
Net Carrying Value	$ 101,845
Weighted Average Interest Rate (as a percent)	4.21%
Non-Recourse BPL Financing, Facility A | Facilities
Debt Instrument [Line Items]
Borrowings	$ 241,549
Unamortized Deferred Issuance Costs / Discount	(1,119)
Net Carrying Value	240,430
Limit	$ 316,543
Non-Recourse BPL Financing, Facility A | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	7.50%
Non-Recourse BPL Financing, Facility B | Facilities
Debt Instrument [Line Items]
Borrowings	$ 84,017
Unamortized Deferred Issuance Costs / Discount	(555)
Net Carrying Value	83,462
Limit	$ 84,017
Non-Recourse BPL Financing, Facility B | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.85%
Recourse BPL Financing, Facility A | Facilities
Debt Instrument [Line Items]
Borrowings	$ 75,109
Unamortized Deferred Issuance Costs / Discount	(368)
Net Carrying Value	74,741
Limit	$ 250,000
Recourse BPL Financing, Facility A | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Recourse BPL Financing, Facility B | Facilities
Debt Instrument [Line Items]
Borrowings	$ 114,386
Unamortized Deferred Issuance Costs / Discount	(176)
Net Carrying Value	114,210
Limit	$ 250,000
Recourse BPL Financing, Facility B | Facilities | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
FHLBC borrowings
Debt Instrument [Line Items]
Borrowings	$ 1,000
Unamortized Deferred Issuance Costs / Discount	0
Net Carrying Value	1,000
Limit	$ 1,000
Weighted Average Interest Rate (as a percent)	0.33%
4.75% convertible senior notes | Convertible notes
Debt Instrument [Line Items]
Borrowings	$ 198,629
Unamortized Deferred Issuance Costs / Discount	(2,610)
Net Carrying Value	$ 196,019
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	(2,634)
Net Carrying Value	$ 147,566
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	(3,970)
Net Carrying Value	$ 168,122
Weighted Average Interest Rate (as a percent)	5.75%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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