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Reserve for Losses and Loss Adjustment Expenses (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
claim
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]      
Minimum period for claims resolution 5 years    
Summary of reserve for losses and loss adjustment expenses      
Balance, beginning of year $ 3,471,147 $ 3,579,940 $ 3,579,940
Less reinsurance recoverables on unpaid losses and loss adjustment expenses 431,889 451,741 451,741
Net balance, beginning of year 3,039,258 3,128,199 3,128,199
Net losses:      
Current year 596,872 616,694 813,515
(Favorable) unfavorable development of reserves established in prior years, net 8,373 (31,528) (36,753)
Total 605,245 585,166 776,762
Paid related to:      
Current year (67,894) (77,854) (108,139)
Prior years (598,281) (557,066) (757,564)
Total paid (666,175) (634,920) (865,703)
Net balance, end of period 2,978,328 3,078,445 3,039,258
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses 417,323 466,483 431,889
Balance, end of period $ 3,395,651 3,544,928 3,471,147
Number of claims, net unfavorable prior year reserve development, from 1997 accident year | claim 1    
Number of claims | claim 4    
Net unfavorable prior year reserve development $ 10,100 4,000  
Net unfavorable prior year reserve development, years 2016 and 2020 7,500    
Reduction in prior year IBNR reserve 6,000    
Specialty P&C Segment      
Net losses:      
(Favorable) unfavorable development of reserves established in prior years, net     9,000
NORCAL Group      
Net losses:      
Current year   4,900 4,900
(Favorable) unfavorable development of reserves established in prior years, net $ 6,700 $ 8,300 $ 10,800