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Notes Payable (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Nov. 18, 2022
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jul. 27, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 08, 2017
USD ($)
Debt Instrument [Line Items]              
Interest rate             4.40%
Debt issuance cost             $ 3,400
Debt instrument, discount percent             99.847%
Effective interest rate             4.45%
Unamortized debt issuance cost     $ 800        
Unsecured Notes One | Level 2 | Notes payable | Unsecured debt              
Debt Instrument [Line Items]              
Unsecured debt     $ 375,000   $ 375,000   $ 375,000
Interest rate     4.40%        
Unsecured Notes Two | Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity $ 200,000         $ 75,000  
Undrawn portion of credit facility     $ 125,000        
Drawn down amount under credit facility     $ 75,000   25,000    
Unsecured Notes Two | Revolving Credit Facility | Consolidated Insurance Subsidiary              
Debt Instrument [Line Items]              
Drawn down amount under credit facility contributed   $ 50,000          
Unsecured Notes Two | Revolving Credit Facility | Subsequent Event              
Debt Instrument [Line Items]              
Effective interest rate       6.58%      
Drawn down amount under credit facility       $ 75,000      
Unsecured Notes Two | Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Commitment fee on undrawn portion of facility 0.125%   0.15%        
Unsecured Notes Two | Revolving Credit Facility | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.125%        
Debt to total capital ratio 0.20            
Unsecured Notes Two | Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Debt to total capital ratio     0.243        
Commitment fee on undrawn portion of facility 0.225%            
Unsecured Notes Two | Revolving Credit Facility | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Debt Instrument [Line Items]              
Debt to total capital ratio 0.30            
Unsecured Notes Two | Level 2 | Notes payable | Unsecured debt              
Debt Instrument [Line Items]              
Unsecured debt     $ 75,000   $ 25,000    
Unsecured Notes Two | Level 2 | Notes payable | Unsecured debt | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.125%        
Unsecured Notes Two | Level 2 | Notes payable | Unsecured debt | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.50%