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Premiums and Reinsurance Related Information (Tables)
 3 Months Ended
Mar. 31, 2024
Insurance [Abstract]  
Reinsurance Financial Information
The following is a summary of insurance and reinsurance financial information:
For the Three Months
Ended March 31,
(In thousands)20242023
Written premiums:
Direct$3,039,066 $2,738,754 
Assumed323,689 310,563 
Ceded(511,464)(474,493)
Total net premiums written$2,851,291 $2,574,824 
Earned premiums:
Direct$2,936,643 $2,667,063 
Assumed337,911 295,230 
Ceded(510,207)(470,861)
Total net premiums earned$2,764,347 $2,491,432 
Ceded losses and loss expenses incurred$305,951 $315,476 
Ceded commissions earned$121,054 $118,418 
Premium receivable, allowance for credit loss The following table presents the rollforward of the allowance for expected credit losses for premiums and fees receivable for the three months ended March 31, 2024 and 2023:
(In thousands)20242023
Allowance for expected credit losses, beginning of period$35,110 $30,660 
Change in expected credit losses(71)1,693 
Allowance for expected credit losses, end of period$35,039 $32,353 
Reinsurance Recoverable, Allowance for Credit Loss
The following table presents the rollforward of the allowance for expected credit losses associated with due from reinsurers for the three months ended March 31, 2024 and 2023:
(In thousands)20242023
Allowance for expected credit losses, beginning of period$8,404 $8,064 
Change in expected credit losses781 639 
Allowance for expected credit losses, end of period$9,185 $8,703