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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