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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