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Allowance for Credit Losses (Reserve Allowance for Various Credit Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 $ 8,634 $ 8,105
Transition adjustment current expected credit losses 2,894 12,217
Write-offs against allowance 3,105 11,688
December 31, 2023 8,423 8,634
Trade Receivables    
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 5,082 6,236
Transition adjustment current expected credit losses 3,555 10,534
Write-offs against allowance 3,105 11,688
December 31, 2023 5,532 5,082
Investments, Fixed Maturities    
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 3,104 1,052
Transition adjustment current expected credit losses 661 2,052
December 31, 2023 2,443 3,104
Investments, Other    
Valuation And Qualifying Accounts [Abstract]    
March 31, 2022 448 817
Transition adjustment current expected credit losses   369
December 31, 2023 $ 448 $ 448