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Reserve for Loss and Loss Expense (Reconciliation of Claims Development to Liability) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net $ 4,259,274      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 757,513 $ 578,641 $ 554,269  
Unallocated loss expenses 128,034      
Gross liability for unpaid loss and loss expenses 5,144,821 $ 4,580,903 $ 4,260,355 $ 4,067,163
Standard Commercial Lines [Member] | General Liability [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 1,688,645      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 246,736      
Standard Commercial Lines [Member] | Workers Compensation [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 809,019      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 199,057      
Standard Commercial Lines [Member] | Commercial Automobile [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 847,967      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 14,271      
Standard Commercial Lines [Member] | Business Owners' Policies [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 110,471      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 19,277      
Standard Commercial Lines [Member] | Commercial Property [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 130,277      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 81,970      
Standard Commercial Lines [Member] | Other Commercial [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 17,995      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 4,443      
Standard Commercial Lines [Member] | Total Standard Commercial Lines [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 3,604,374      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 565,754      
Standard Personal Lines | Personal Automobile [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 99,982      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 36,529      
Standard Personal Lines | Homeowners [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 45,597      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 7,124      
Standard Personal Lines | Other Personal [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 11,739      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 132,525      
Standard Personal Lines | Standard Personal Lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 157,318      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 176,178      
E&S Lines [Member] | Total E&S Lines [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 497,582      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 15,581      
E&S Lines [Member] | Standard Commercial Lines [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 4,184      
E&S Lines [Member] | Property Insurance [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 18,075      
E&S Lines [Member] | Casualty Insurance Product Line [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 479,507      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments $ 11,397