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Schedule IV. Supplemental Schedule of Reinsurance Premiums (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]      
Gross Amounts $ 799,717 $ 536,595 $ 404,525
Ceded to Other Companies 1,863,350 1,662,815 1,414,383
Assumed 6,257,814 5,078,682 4,348,261
Net premiums earned (Note 7) $ 5,194,181 $ 3,952,462 $ 3,338,403
Percentage of Amount Assumed to Net 120.00% 128.00% 130.00%