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Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Premiums Written And Earned) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Effects of Reinsurance [Line Items]        
Direct premiums written $ 2,027,954 $ 1,975,844 $ 3,766,119 $ 3,620,933
Direct premiums earned 1,785,649 1,697,675 3,606,663 3,344,183
Assumed premiums written 345,238 271,303 929,897 881,256
Assumed premiums earned 372,850 344,720 713,273 648,490
Ceded premiums written (916,797) (941,509) (1,593,143) (1,719,458)
Ceded premiums earned (798,325) (842,934) (1,629,053) (1,589,235)
Net premiums written 1,456,395 1,305,638 3,102,873 2,782,731
Net premiums earned 1,360,174 1,199,461 2,690,883 2,403,438
Underwriting [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 1,460,090 1,323,128 2,809,331 2,450,516
Direct premiums earned 1,287,268 1,159,544 2,562,939 2,291,100
Assumed premiums written 316,905 268,837 895,561 846,934
Assumed premiums earned 346,262 331,842 672,962 619,217
Ceded premiums written (319,772) (286,978) (599,161) (515,610)
Ceded premiums earned (272,600) (292,374) (542,138) (507,540)
Net premiums written 1,457,223 1,304,987 3,105,731 2,781,840
Net premiums earned 1,360,930 1,199,012 2,693,763 2,402,777
Program services and other [Member]        
Effects of Reinsurance [Line Items]        
Direct premiums written 567,864 652,716 956,788 1,170,417
Direct premiums earned 498,381 538,131 1,043,724 1,053,083
Assumed premiums written 28,333 2,466 34,336 34,322
Assumed premiums earned 26,588 12,878 40,311 29,273
Ceded premiums written (597,025) (654,531) (993,982) (1,203,848)
Ceded premiums earned (525,725) (550,560) (1,086,915) (1,081,695)
Net premiums written (828) 651 (2,858) 891
Net premiums earned $ (756) $ 449 $ (2,880) $ 661