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Reserve for Loss and Loss Expense - Schedule of Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance $ 5,397,736      
Total reinsurance recoverable on unpaid loss 1,022,245 $ 618,601 $ 757,513 $ 578,641
Unallocated loss expenses 169,820      
Total gross liability for unpaid loss and loss expenses 6,589,801 $ 5,336,911 $ 5,144,821 $ 4,580,903
Standard Commercial Lines | Total Standard Commercial Lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 4,551,605      
Total reinsurance recoverable on unpaid loss 692,000      
Standard Commercial Lines | General liability        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 2,432,883      
Total reinsurance recoverable on unpaid loss 396,702      
Standard Commercial Lines | Workers Compensation        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 757,202      
Total reinsurance recoverable on unpaid loss 238,995      
Standard Commercial Lines | Commercial automobile        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 1,073,194      
Total reinsurance recoverable on unpaid loss 14,774      
Standard Commercial Lines | Businessowners’ policies        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 117,985      
Total reinsurance recoverable on unpaid loss 2,604      
Standard Commercial Lines | Commercial property        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 151,963      
Total reinsurance recoverable on unpaid loss 36,313      
Standard Commercial Lines | Other        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 18,378      
Total reinsurance recoverable on unpaid loss 2,612      
Standard Personal Lines | Standard Personal Lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 224,434      
Total reinsurance recoverable on unpaid loss 310,361      
Standard Personal Lines | Personal automobile        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 154,177      
Total reinsurance recoverable on unpaid loss 35,386      
Standard Personal Lines | Homeowners        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 53,380      
Total reinsurance recoverable on unpaid loss 1,962      
Standard Personal Lines | Other        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 16,877      
Total reinsurance recoverable on unpaid loss 273,013      
E&S Lines | Total E&S Lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 621,697      
Total reinsurance recoverable on unpaid loss 19,884      
E&S Lines | Casualty lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 601,439      
Total reinsurance recoverable on unpaid loss 18,903      
E&S Lines | Property lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total liabilities for unpaid loss and loss expenses, net of reinsurance 20,258      
Total reinsurance recoverable on unpaid loss $ 981