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Notes Payable - Schedule of Long-term Debt (Details)
12 Months Ended
Feb. 13, 2024
USD ($)
Nov. 30, 2023
USD ($)
Mar. 08, 2017
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nov. 18, 2022
USD ($)
Mar. 31, 2021
USD ($)
Debt Instrument [Line Items]              
Total principal amount       $ 575,000,000 $ 400,000,000    
Less unamortized discount and debt issuance costs       1,271,000 1,670,000    
Notes payable       573,729,000 398,330,000    
Revolving Credit Facility              
Debt Instrument [Line Items]              
Repayments of debt     $ 320,000,000        
Unsecured Notes Two | Revolving Credit Facility              
Debt Instrument [Line Items]              
Loan maximum borrowing capacity   $ 250,000,000       $ 200,000,000 $ 75,000,000
Drawn down amount under credit facility       200,000,000 25,000,000    
Unamortized debt issuance cost       800,000      
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]              
Interest rate, effective percentage 6.84%            
Drawn down amount under credit facility $ 200,000,000            
Undrawn portion of credit facility $ 50,000,000            
Unsecured notes              
Debt Instrument [Line Items]              
Notes payable       $ 373,729,000 373,330,000    
Unsecured notes | Notes payable | Level 2 | Unsecured Notes One              
Debt Instrument [Line Items]              
Interest rate, stated percentage     4.40% 4.40%      
Unsecured debt     $ 375,000,000 $ 375,000,000 375,000,000    
Debt issuance costs     $ 3,400,000        
Discount percent     99.847%        
Interest rate, effective percentage     4.45%        
Unsecured notes | Notes payable | Level 2 | Unsecured Notes Two              
Debt Instrument [Line Items]              
Unsecured debt       $ 200,000,000 $ 25,000,000    
Minimum | Unsecured Notes Two | Revolving Credit Facility              
Debt Instrument [Line Items]              
Commitment fee on undrawn portion of facility   0.125%   0.175%      
Maximum | Unsecured Notes Two | Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt to total capital ratio       0.271      
Commitment fee on undrawn portion of facility   0.225%          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Unsecured Notes Two | Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt to total capital ratio   0.30          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Unsecured notes | Notes payable | Level 2 | Unsecured Notes Two              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.125%      
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Unsecured Notes Two | Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt to total capital ratio   0.20          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Unsecured notes | Notes payable | Level 2 | Unsecured Notes Two              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.50%