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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2022
Reinsurance Disclosures [Abstract]  
Reinsurance Financial Information
The following is a summary of reinsurance financial information:
(In thousands)202220212020
Written premiums:   
Direct$10,695,138 $9,531,050 $7,874,050 
Assumed1,213,914 1,169,084 973,597 
Ceded(1,904,982)(1,837,267)(1,585,210)
Total net written premiums$10,004,070 $8,862,867 $7,262,437 
Earned premiums:  
Direct$10,217,891 $8,825,568 $7,489,470 
Assumed1,226,801 1,085,804 941,321 
Ceded(1,883,263)(1,805,341)(1,499,948)
Total net earned premiums$9,561,429 $8,106,031 $6,930,843 
Ceded losses and loss expenses incurred$1,269,338 $1,236,960 $955,630 
Ceded commission earned$477,437 $449,739 $358,253 
Schedule of 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 years ended December 31, 2022 and 2021:
(In thousands)20222021
Allowance for expected credit losses, beginning of period$25,218 $22,883 
Change in allowance for expected credit losses5,442 2,335 
Allowance for expected credit losses, end of period$30,660 $25,218 
Schedule of 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 years ended December 31, 2022 and 2021:
(In thousands)20222021
Allowance for expected credit losses, beginning of period$7,713 $7,801 
Change in allowance for expected credit losses351 (88)
Allowance for expected credit losses, end of period$8,064 $7,713 
Schedule of Ceded Credit Risk by Reinsurer The following table presents the amounts due from reinsurers as of December 31, 2022:
(In thousands)
Lloyd’s of London$347,927 
Berkshire Hathaway332,034 
Munich Re306,530 
Partner Re275,410 
Hannover Re Group191,264 
Swiss Re189,591 
Lifson Re180,724 
Renaissance Re163,973 
Everest Re155,847 
Liberty Mutual96,402 
Axis Capital81,538 
Korean Re59,884 
Fairfax Financial55,228 
Axa Insurance46,058 
Arch Capital Group45,663 
Sompo Holdings Group36,157 
Helvetia Holdings Group30,823 
Markel Corp Group30,216 
Validus Holdings Group24,548 
TOA Re22,945 
Other reinsurers less than $20,000342,275 
Subtotal3,015,037 
Residual market pools (1)180,757 
Allowance for expected credit losses(8,064)
Total$3,187,730 
(1)Many states require licensed insurers that provide workers' compensation insurance to participate in programs that provide workers' compensation to employers that cannot procure coverage from an insurer on a voluntary basis. Insurers can fulfill this residual market obligation by participating in pools where results are shared by the participating companies. The Company acts as a servicing carrier for workers' compensation pools in certain states. As a servicing carrier, the Company writes residual market business directly and then cedes 100% of this business to the respective pool. As a servicing carrier, the Company receives fee income for its services. The Company does not retain underwriting risk, and credit risk is limited as ceded balances are jointly shared by all the pool members.