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Reinsurance (Premiums Written And Earned And Incurred Losses And LAE) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reinsurance [Abstract] |  |  |
Written premiums: Direct | $ 3,987,875 | $ 3,217,999 | $ 2,783,036
Written premiums: Assumed | 9,061,881 | 7,264,362 | 6,350,328
Written premiums: Ceded | (1,604,251) | (1,365,378) | (1,308,940)
Net written premiums | 11,445,505 | 9,116,983 | 7,824,424
Premiums earned: Direct | 3,588,926 | 3,028,095 | 2,551,662
Premiums earned: Assumed | 8,315,072 | 7,054,680 | 6,059,222
Premiums earned: Ceded | (1,497,557) | (1,401,262) | (1,207,198)
Net premiums earned | 10,406,441 | 8,681,513 | 7,403,686
Incurred losses and LAE: Direct | 2,384,960 | 2,141,065 | 1,618,686
Incurred losses and LAE: Assumed | 5,741,109 | 5,163,946 | 3,923,298
Incurred losses and LAE: Ceded | (734,816) | (754,174) | (619,086)
Net incurred losses and LAE | $ 7,391,253 | $ 6,550,837 | $ 4,922,898

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