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Supplemental Reinsurance Premiums
12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]  
Supplemental Reinsurance Premiums
202020192018
 (Amounts in thousands)
Direct amounts$3,603,780 $3,655,233 $3,416,687 
Ceded to other companies(56,212)(56,725)(48,941)
Assumed8,067 910 665 
Net amounts$3,555,635 $3,599,418 $3,368,411