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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Effects of Reinsurance [Line Items]    
Direct premiums written $ 2,852,425 $ 2,542,574
Direct premiums earned 2,901,920 2,612,989
Assumed premiums written 1,087,974 893,438
Assumed premiums earned 516,213 473,436
Ceded premiums written (1,708,362) (1,218,234)
Ceded premiums earned (1,290,506) (1,118,721)
Net premiums written 2,232,037 2,217,778
Net premiums earned 2,127,627 1,967,704
Underwriting [Member]    
Effects of Reinsurance [Line Items]    
Direct premiums written 2,107,467 1,969,363
Direct premiums earned 2,198,238 1,971,876
Assumed premiums written 668,699 688,895
Assumed premiums earned 392,942 398,719
Ceded premiums written (543,956) (440,029)
Ceded premiums earned (463,380) (402,440)
Net premiums written 2,232,210 2,218,229
Net premiums earned 2,127,800 1,968,155
Program services and other fronting [Member]    
Effects of Reinsurance [Line Items]    
Direct premiums written 744,958 573,211
Direct premiums earned 703,682 641,113
Assumed premiums written 419,275 204,543
Assumed premiums earned 123,271 74,717
Ceded premiums written (1,164,406) (778,205)
Ceded premiums earned (827,126) (716,281)
Net premiums written (173) (451)
Net premiums earned $ (173) $ (451)