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Commitments and Contingencies (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2022 | Sep. 01, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Mar. 31, 2023 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 30, 2023 | Oct. 03, 2022 | Dec. 07, 2021
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental expense |  |  | $ 1,700 | $ 1,600 | $ 1,600 | $ 6,600 | $ 600 | $ 600 |  |  |
Potential gross capital commitments |  |  | 60,200 |  | 69,100 | 61,100 |  |  |  |  |
Capital funding commitment reserves |  |  | $ 100 |  |  | $ 100 |  |  |  |  |
Portfolio percentage of unfunded commitment |  |  | 88.00% |  |  | 88.00% |  |  |  |  |
Contingent consideration payable |  |  |  |  | $ 20,152 | $ 0 |  |  |  |  |
Issuance of preferred stock to satisfy contingent consideration payable |  | $ 20,100 |  |  |  | $ 20,100 |  |  |  |  |
Customer ExAlt Trusts |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Alternative investments acquired |  |  |  |  |  |  |  |  |  |  | $ 352,600
Paul Capital Advisors Lawsuit |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimate of potential negative impact |  |  |  |  |  |  |  |  |  | $ 350,000 |
Private Arbitration |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total damages sought | $ 36,300 |  |  |  |  |  |  |  |  |  |
Chapter 11 Cases | Minimum |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimate of potential negative impact |  |  |  |  |  |  |  |  | $ 155,000 |  |
Chapter 11 Cases | Maximum |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimate of potential negative impact |  |  |  |  |  |  |  |  | 382,000 |  |
Official Committee of Bondholders Motion |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimate of potential negative impact |  |  |  |  |  |  |  |  | $ 500,000 |  |

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