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General (Tables)
 9 Months Ended
Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Effects of Reinsurance
The effect of reinsurance on property and casualty premiums written and earned was as follows:

Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
 (Amounts in thousands)
Premiums Written
Direct $1,458,934 $1,230,024 $4,133,920 $3,374,477 
Ceded(42,938)(30,889)(106,121)(78,463)
Assumed137 195 15,381 15,293 
     Net$1,416,133 $1,199,330 $4,043,180 $3,311,307 
Premiums Earned
Direct$1,351,870 $1,110,013 $3,794,663 $3,174,296 
Ceded(42,444)(30,917)(104,894)(78,114)
Assumed3,856 3,883 11,578 11,630 
     Net$1,313,282 $1,082,979 $3,701,347 $3,107,812 
Allowance for Credit Losses on Premium Receivable
The following table presents a summary of changes in allowance for credit losses on premiums receivable:
 Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
 (Amounts in thousands)
Beginning balance$6,000 $5,400 $5,300 $5,800 
     Provision during the period for expected credit losses 763 537 2,735 2,005 
Write-off amounts during the period(908)(863)(2,566)(3,010)
Recoveries during the period of amounts previously written off 245 126 631 405 
Ending balance $6,100 $5,200 $6,100 $5,200