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Schedule IV. Supplemental Schedule of Reinsurance Premiums (Details) - USD ($) $ in Thousands | 12 Months Ended
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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%

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