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Reserve for Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
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 $ 3,401,281 $ 3,471,147 $ 3,471,147
Less reinsurance recoverables on unpaid losses and loss adjustment expenses 445,573 431,889 431,889
Net balance, beginning of year 2,955,708 3,039,258 3,039,258
Net losses:      
Current year 195,110 198,240 794,848
(Favorable) unfavorable development of reserves established in prior years, net (416) 7,056 5,646
Total 194,694 205,296 800,494
Paid related to:      
Current year (12,867) (11,052) (101,996)
Prior years (202,180) (211,916) (782,048)
Total paid (215,047) (222,968) (884,044)
Net balance, end of period 2,935,355 3,021,586 2,955,708
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses 447,157 447,693 445,573
Balance, end of period 3,382,512 3,469,279 3,401,281
Net unfavorable prior year reserve development 900    
Net unfavorable reserve development attributable to parent 400    
Net favorable development in workers' compensation business 500    
Net unfavorable development medical professional liability business 1,400    
NORCAL Group      
Net losses:      
Current year 1,700    
(Favorable) unfavorable development of reserves established in prior years, net $ 1,700 $ 2,500 $ 8,300