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Premiums and Reinsurance Related Information
 9 Months Ended
Sep. 30, 2021
Insurance [Abstract]  
Premiums and Reinsurance Related Information Premiums and Reinsurance Related Information
The following is a summary of insurance and reinsurance financial information:
For the Three Months
Ended September 30,		For the Nine Months
Ended September 30,
(In thousands)2021202020212020
Written premiums:
Direct$2,490,875 $2,018,530 $7,063,151 $5,875,379 
Assumed296,623 244,015 870,295 750,784 
Ceded(462,360)(383,229)(1,346,089)(1,161,183)
Total net premiums written$2,325,138 $1,879,316 $6,587,357 $5,464,980 
Earned premiums:
Direct$2,276,173 $1,877,234 $6,430,957 $5,511,791 
Assumed273,808 237,815 792,515 699,025 
Ceded(468,963)(366,128)(1,320,874)(1,093,563)
Total net premiums earned$2,081,018 $1,748,921 $5,902,598 $5,117,253 
Ceded losses and loss expenses incurred$318,283 $209,706 $872,186 $677,761 
Ceded commissions earned$113,523 $89,104 $322,037 $255,742 
    
The following table presents the rollforward of the allowance for expected credit losses for premiums and fees receivable for the nine months ended September 30, 2021 and 2020:
(In thousands)20212020
Allowance for expected credit losses, beginning of period$22,883 $19,823 
Cumulative effect adjustment resulting from changes in accounting principles— 1,270 
Provision for expected credit losses793 1,940 
Allowance for expected credit losses, end of period$23,676 $23,033 
The following table presents the rollforward of the allowance for expected credit losses for premiums and fees receivable for the three months ended September 30, 2021 and 2020:
(In thousands)20212020
Allowance for expected credit losses, beginning of period$24,808 $22,106 
Provision for expected credit losses(1,132)927 
Allowance for expected credit losses, end of period$23,676 $23,033 
The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. The Company also cedes premiums to state assigned risk plans and captive insurance companies. Estimated amounts due from reinsurers are reported net of an allowance for expected credit losses.
The following table presents the rollforward of the allowance for expected credit losses associated with due from reinsurers for the nine months ended September 30, 2021 and 2020:
(In thousands)20212020
Allowance for expected credit losses, beginning of period$7,801 $690 
Cumulative effect adjustment resulting from changes in accounting principles— 5,927 
Provision for expected credit losses(524)1,124 
Allowance for expected credit losses, end of period$7,277 $7,741 
The following table presents the rollforward of the allowance for expected credit losses associated with due from reinsurers for the three months ended September 30, 2021 and 2020:
(In thousands)20212020
Allowance for expected credit losses, beginning of period$7,283 $7,175 
Provision for expected credit losses(6)566 
Allowance for expected credit losses, end of period$7,277 $7,741