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Reserves for Loss and Loss Expenses (Tables)
6 Months Ended
Jun. 30, 2024
Insurance [Abstract]  
Reserve Balances The table below provides a reconciliation of the beginning and ending reserve balances:
June 30,
(In thousands)20242023
Net reserves at beginning of period$15,661,820 $14,248,879 
Net provision for losses and loss expenses:
Claims occurring during the current year (1)3,411,888 3,064,046 
Increase in estimates for claims occurring in prior years (2) (3)14,700 28,853 
Loss reserve discount accretion 17,786 15,510 
Total3,444,374 3,108,409 
Net payments for claims:  
Current year383,639 375,365 
Prior years2,205,566 2,019,371 
Total2,589,205 2,394,736 
Foreign currency translation(56,143)5,929 
Net reserves at end of period16,460,846 14,968,481 
Ceded reserves at end of period3,106,344 2,951,515 
Gross reserves at end of period$19,567,190 $17,919,996 
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(1) Claims occurring during the current year are net of loss reserve discounts of $26 million and $22 million for the six months ended June 30, 2024 and 2023, respectively.
(2) The change in estimates for claims occurring in prior years is net of loss reserve discount. On an undiscounted basis, the estimates for claims occurring in prior years increased by $7 million and decreased by $6 million for the six months ended June 30, 2024 and 2023, respectively.
(3) For certain retrospectively rated insurance policies and reinsurance agreements, reserve development is offset by additional or return premiums. Favorable development, net of additional and return premiums, was $2 million and adverse development was $21 million for the six months ended June 30, 2024 and 2023, respectively.