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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2019	Jun. 30, 2018	Aug. 31, 2017
Debt Instrument [Line Items]
Borrowings		$ 1,650,576	$ 1,441,331
Unamortized Deferred Issuance Costs / Discount		(9,743)	(15,846)
Net Carrying Value		1,640,833	1,425,485
Line of Credit
Debt Instrument [Line Items]
Borrowings		990,155	779,910
Unamortized Deferred Issuance Costs / Discount		(1,672)	(5,184)
Net Carrying Value		988,483	774,726
Trust Preferred Securities and Subordinated Notes
Debt Instrument [Line Items]
Borrowings		139,500	139,500
Unamortized Deferred Issuance Costs / Discount		(779)	(826)
Net Carrying Value		$ 138,721	$ 138,674
Trust Preferred Securities and Subordinated Notes | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		2.25%	2.25%
Non-Marginable Debt Repurchase Agreement One | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings		$ 144,385	$ 178,167
Unamortized Deferred Issuance Costs / Discount		(313)	(729)
Net Carrying Value		$ 144,072	$ 177,438
Weighted Average Interest Rate (as a percent)		4.21%	4.21%
Non-Marginable Debt Repurchase Agreement Two | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings		$ 102,351	$ 102,856
Unamortized Deferred Issuance Costs / Discount		(353)	(656)
Net Carrying Value		$ 101,998	$ 102,200
Weighted Average Interest Rate (as a percent)		4.21%	4.21%
Facility B | Recourse Subordinate Securities Financing | Affiliated Entity
Debt Instrument [Line Items]
Borrowings		$ 91,707
Unamortized Deferred Issuance Costs / Discount		(376)
Net Carrying Value		$ 91,331
Weighted Average Interest Rate (as a percent)		4.75%
Non-Recourse Business Purpose Loan Financing Facility One | Non-Recourse Business Purpose Loans
Debt Instrument [Line Items]
Borrowings			$ 251,721
Unamortized Deferred Issuance Costs / Discount			(2,452)
Net Carrying Value			249,269
Limit			$ 372,248
Non-Recourse Business Purpose Loan Financing Facility One | Non-Recourse Business Purpose Loans | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			7.50%
Non-Recourse Business Purpose Loan Financing Facility Two | Non-Recourse Business Purpose Loans
Debt Instrument [Line Items]
Borrowings			$ 115,081
Unamortized Deferred Issuance Costs / Discount			(666)
Net Carrying Value			114,415
Limit			$ 185,240
Non-Recourse Business Purpose Loan Financing Facility Two | Non-Recourse Business Purpose Loans | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.75%		3.85%
Non-Recourse Business Purpose Loan Financing Facility Two | Line of Credit
Debt Instrument [Line Items]
Borrowings		$ 307,215
Unamortized Deferred Issuance Costs / Discount		(507)
Net Carrying Value		306,708
Limit		$ 400,000
Non-Recourse Business Purpose Loan Financing Facility Two | Line of Credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		2.75%
Recourse BPL Financing, Facility D | Line of Credit
Debt Instrument [Line Items]
Borrowings		$ 110,148	$ 80,135
Unamortized Deferred Issuance Costs / Discount		0	(193)
Net Carrying Value		110,148	79,942
Limit		$ 450,000	$ 250,000
Recourse BPL Financing, Facility D | Line of Credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		3.35%	3.00%
Recourse Business Purpose Loan Financing Facility Through September 2023 | Line of Credit
Debt Instrument [Line Items]
Borrowings		$ 234,349
Unamortized Deferred Issuance Costs / Discount		(123)
Net Carrying Value		234,226
Limit		$ 450,000
Recourse Business Purpose Loan Financing Facility Through September 2023 | Line of Credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.35%	2.21%
FHLBC Borrowing Facility
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)			0.30%
Senior Notes Due 2023 | Convertible notes
Debt Instrument [Line Items]
Borrowings		$ 198,629	$ 198,629
Unamortized Deferred Issuance Costs / Discount		(1,836)	(2,862)
Net Carrying Value		$ 196,793	$ 195,767
Weighted Average Interest Rate (as a percent)		4.75%	4.75%			4.75%
Senior Notes Due 2024 | Convertible notes
Debt Instrument [Line Items]
Borrowings		$ 150,200	$ 150,200
Unamortized Deferred Issuance Costs / Discount		(2,072)	(2,815)
Net Carrying Value		$ 148,128	$ 147,385
Weighted Average Interest Rate (as a percent)		5.625%	5.625%	5.625%	5.625%
Exchangeable Senior Notes Due 2025 | Convertible notes
Debt Instrument [Line Items]
Borrowings		$ 172,092	$ 172,092
Unamortized Deferred Issuance Costs / Discount		(3,384)	(4,159)
Net Carrying Value		$ 168,708	$ 167,933
Weighted Average Interest Rate (as a percent)		5.75%	5.75%	5.75%
Recourse BPL Financing, Facility C | Line of Credit
Debt Instrument [Line Items]
Borrowings			$ 51,950
Unamortized Deferred Issuance Costs / Discount			(488)
Net Carrying Value			51,462
Limit			$ 350,000
Recourse BPL Financing, Facility C | Line of Credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			3.00%

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