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Life Insurance Liabilities (Present Value Expected Future Policy Benefits) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense $ 871,530 $ 841,861    
Oxford | Life Insurance [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense 370,950 384,875    
Moving and Storage Consolidations [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense 376,877 327,497    
Property and Casualty Insurance [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Claims And Claims Adjustment Expense 123,703 129,489    
Life Insurance Segment [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year 482,805 522,122    
Beginning balance at original discount rate 490,975 514,113    
Effect of actual variances from expected experience     $ 912 $ 367
Adjusted beginning of year balance     $ 490,639 $ 513,649
Issuances 1,726 2,002    
Interest accrual 5,915 6,279    
Net premium collected 16,748 14,142    
Ending balance at original discount rate 481,532 507,788    
Effect of changes in discount rate assumptions (AOCI) 984 4,331    
Balance, end of the year 480,548 503,457    
End of period, LFPB, net 301,182 306,724    
Payout annuities and market risk benefits        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits 24,063 24,569    
Health Insurance Product Line [Member]        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits 9,736 13,189    
Life and annuity claims in course of settlement and claims incurred but not yet reported / Reinsurance losses payable        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits 27,301 30,916    
Life DPL / Other life and health        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits $ 8,668 9,408    
LFPB flooring effect        
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward]        
Liability For Future Policy Benefits   $ 69