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Notes Payable (Schedule of Long-term Debt) (Details)
 6 Months Ended 12 Months Ended
Jul. 25, 2024
USD ($)
Nov. 18, 2022
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 30, 2023
USD ($)
Mar. 31, 2021
USD ($)
Mar. 08, 2017
USD ($)
Debt Instrument [Line Items]              
Interest rate             4.40%
Total principal amount     $ 575,000,000 $ 575,000,000      
Less unamortized discount and debt issuance costs     1,072,000 1,271,000      
Notes payable     573,928,000 573,729,000      
Debt issuance cost             $ 3,400,000
Debt instrument, discount percent             99.847%
Effective interest rate             4.45%
Unamortized debt issuance cost     700,000        
Unsecured Notes Two | Revolving Credit Facility              
Debt Instrument [Line Items]              
Loan maximum borrowing capacity   $ 200,000,000     $ 250,000,000 $ 75,000,000  
Drawn down amount under credit facility     200,000,000 200,000,000      
Unsecured Notes Two | Revolving Credit Facility | Consolidated Insurance Subsidiary              
Debt Instrument [Line Items]              
Drawn down amount under credit facility contributed     150,000,000        
Unsecured Notes Two | Revolving Credit Facility | Subsequent Event              
Debt Instrument [Line Items]              
Effective interest rate 6.81%            
Drawn down amount under credit facility $ 200,000,000            
Remaining amount available to be drawn $ 50,000,000            
Unsecured notes              
Debt Instrument [Line Items]              
Notes payable     $ 373,928,000 373,729,000      
Unsecured notes | Notes payable | Level 2 | Unsecured Notes One              
Debt Instrument [Line Items]              
Interest rate     4.40%        
Unsecured debt     $ 375,000,000 375,000,000     $ 375,000,000
Unsecured notes | Notes payable | Level 2 | Unsecured Notes Two              
Debt Instrument [Line Items]              
Unsecured debt     $ 200,000,000 $ 200,000,000      
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% 0.175%        
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 0.259        
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%