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Supplemental Reinsurance Premiums
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]  
Supplemental Reinsurance Premiums
202320222021
 (Amounts in thousands)
Direct amounts$4,368,342 $4,022,611 $3,793,664 
Ceded to other companies(109,445)(80,950)(65,017)
Assumed15,481 10,821 13,301 
Net amounts$4,274,378 $3,952,482 $3,741,948