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Reinsurance
 12 Months Ended
Dec. 31, 2021
Reinsurance Disclosures [Abstract]  
Reinsurance Premiums and Reinsurance Related Information
The Company reinsures a portion of its insurance exposures in order to reduce its net liability on individual risks and catastrophe losses. Reinsurance coverage and retentions vary depending on the line of business, location of the risk and nature of loss. The Company’s reinsurance purchases include the following: property reinsurance treaties that reduce exposure to large individual property losses and catastrophe events; casualty reinsurance treaties that reduce its exposure to large individual casualty losses, workers’ compensation catastrophe losses and casualty losses involving multiple claimants or insureds; and facultative reinsurance that reduces exposure on individual policies or risks for losses that exceed treaty reinsurance capacity. Depending on the business, the Company purchases specific additional reinsurance to supplement the above programs.
The following is a summary of reinsurance financial information:
(In thousands)202120202019
Written premiums:   
Direct$9,531,050 $7,874,050 $7,386,759 
Assumed1,169,084 973,597 875,459 
Ceded(1,837,267)(1,585,210)(1,398,719)
Total net written premiums$8,862,867 $7,262,437 $6,863,499 
Earned premiums:  
Direct$8,825,568 $7,489,470 $7,141,427 
Assumed1,085,804 941,321 820,705 
Ceded(1,805,341)(1,499,948)(1,328,844)
Total net earned premiums$8,106,031 $6,930,843 $6,633,288 
Ceded losses and loss expenses incurred$1,236,960 $955,630 $836,831 
Ceded commission earned$449,739 $358,253 $314,191 

The following table presents the rollforward of the allowance for expected credit losses for premiums and fees receivable for the years ended December 31, 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 losses2,335 1,790 
Allowance for expected credit losses, end of period$25,218 $22,883 
Estimated amounts due from reinsurers are reported net of an allowance for expected credit losses of $7,712,903, $7,800,649 and $690,127 as of December 31, 2021, 2020 and 2019, respectively. The following table presents the rollforward of the allowance for expected credit losses associated with due from reinsurers for the years ended December 31, 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(88)1,184 
Allowance for expected credit losses, end of period$7,713 $7,801 
     The following table presents the amounts due from reinsurers as of December 31, 2021:
(In thousands)
Munich Re$313,150 
Lloyd’s of London308,119 
Partner Re231,251 
Alleghany Group204,699 
Swiss Re203,165 
Hannover Re Group167,906 
Everest Re162,432 
Renaissance Re138,408 
Berkshire Hathaway126,806 
Axis Capital88,938 
Liberty Mutual85,367 
Lifson Re64,242 
Arch Capital Group58,156 
Korean Re55,643 
Fairfax Financial43,975 
Axa Insurance40,014 
Markel Corp Group26,737 
Sompo Holdings Group24,220 
Helvetia Holdings Group23,986 
Other reinsurers less than $20,000350,287 
Subtotal2,717,501 
Residual market pools (1)213,238 
Allowance for expected credit losses(7,713)
Total$2,923,026 
(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.