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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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