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Notes Payable (Schedule of Long-term Debt) (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Oct. 30, 2025
USD ($)
Nov. 22, 2024
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Nov. 30, 2023
USD ($)
Nov. 18, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 08, 2017
USD ($)
Debt Instrument [Line Items]                
Interest rate (in percent)               4.40%
Total principal amount     $ 575,000 $ 575,000        
Less unamortized discount and debt issuance costs     573 872        
Notes payable     574,427 574,128        
Debt issuance cost               $ 3,400
Debt instrument, discount percent               99.847%
Effective interest rate               4.45%
Unamortized debt issuance cost     500          
Unsecured Notes Two | Revolving Credit Facility                
Debt Instrument [Line Items]                
Loan maximum borrowing capacity         $ 250,000 $ 200,000 $ 75,000  
Drawn down amount under credit facility     200,000 200,000        
Unsecured Notes Two | Revolving Credit Facility | Consolidated Insurance Subsidiary                
Debt Instrument [Line Items]                
Drawn down amount under credit facility contributed     150,000          
Unsecured Notes Two | Revolving Credit Facility | Subsequent Event                
Debt Instrument [Line Items]                
Effective interest rate 5.48%              
Drawn down amount under credit facility $ 200,000              
Remaining amount available to be drawn $ 50,000              
Unsecured notes                
Debt Instrument [Line Items]                
Notes payable     $ 374,427 374,128        
Unsecured notes | Notes payable | Level 2 | Unsecured Notes One                
Debt Instrument [Line Items]                
Interest rate (in percent)     4.40%          
Unsecured debt     $ 375,000 375,000       $ 375,000
Unsecured notes | Notes payable | Level 2 | Unsecured Notes Two                
Debt Instrument [Line Items]                
Unsecured debt     $ 200,000 $ 200,000        
Minimum | Unsecured Notes Two | Revolving Credit Facility                
Debt Instrument [Line Items]                
Basis spread on variable rate     1.125%          
Debt to total capital ratio   0.20            
Commitment fee on undrawn portion of facility   0.125% 0.15%          
Minimum | Unsecured notes | Notes payable | Level 2 | Unsecured Notes Two                
Debt Instrument [Line Items]                
Basis spread on variable rate     1.125%          
Maximum | Unsecured Notes Two | Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt to total capital ratio   0.30 0.205          
Commitment fee on undrawn portion of facility   0.225%            
Maximum | Unsecured notes | Notes payable | Level 2 | Unsecured Notes Two                
Debt Instrument [Line Items]                
Basis spread on variable rate     1.50%