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Reinsurance (Premiums Written And Earned And Incurred Losses And LAE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reinsurance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Written premiums: Direct |  |  |  |  |  |  |  |  | $ 3,217,999 | $ 2,783,036 | $ 2,240,951
Written premiums: Assumed |  |  |  |  |  |  |  |  | 7,264,362 | 6,350,328 | 6,234,203
Written premiums: Ceded |  |  |  |  |  |  |  |  | (1,365,378) | (1,308,940) | (1,060,726)
Net written premiums | $ 2,449,346 | $ 2,448,680 | $ 2,017,478 | $ 2,201,479 | $ 2,120,186 | $ 2,068,557 | $ 1,783,983 | $ 1,851,698 | 9,116,983 | 7,824,424 | 7,414,428
Premiums earned: Direct |  |  |  |  |  |  |  |  | 3,028,095 | 2,551,662 | 2,129,320
Premiums earned: Assumed |  |  |  |  |  |  |  |  | 7,054,680 | 6,059,222 | 5,807,332
Premiums earned: Ceded |  |  |  |  |  |  |  |  | (1,401,262) | (1,207,198) | (1,004,953)
Net premiums earned | $ 2,396,483 | $ 2,205,811 | $ 2,042,405 | $ 2,036,814 | $ 1,948,071 | $ 1,905,619 | $ 1,817,299 | $ 1,732,697 | 8,681,513 | 7,403,686 | 6,931,699
Incurred losses and LAE: Direct |  |  |  |  |  |  |  |  | 2,141,065 | 1,618,686 | 1,372,589
Incurred losses and LAE: Assumed |  |  |  |  |  |  |  |  | 5,163,946 | 3,923,298 | 5,046,947
ncurred losses and LAE: Ceded |  |  |  |  |  |  |  |  | (754,174) | (619,086) | (768,133)
Net incurred losses and LAE |  |  |  |  |  |  |  |  | $ 6,550,837 | $ 4,922,898 | $ 5,651,403

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