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Supplemental Reinsurance Premiums
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]  
Supplemental Reinsurance Premiums
202120202019
 (Amounts in thousands)
Direct amounts$3,793,664 $3,603,780 $3,655,233 
Ceded to other companies(65,017)(56,212)(56,725)
Assumed13,301 8,067 910 
Net amounts$3,741,948 $3,555,635 $3,599,418