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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Gross written premium $ 13,049,756 $ 10,482,361 $ 9,133,364
Net written premiums 11,445,505 9,116,983 7,824,424
Premiums earned 10,406,441 8,681,513 7,403,686
Incurred losses and LAE 7,391,253 6,550,837 4,922,898
Commission and brokerage 2,208,766 1,873,250 1,703,726
Other underwriting expenses 582,647 511,237 440,899
Underwriting gain (loss) 223,775 (253,811) 336,163
Net investment income 1,164,892 642,465 647,139
Net realized capital gains (losses) 257,943 267,649 185,004
Corporate expenses (67,827) (41,118) (32,966)
Interest, fee and bond issue cost amortization expense (70,149) (36,323) (31,693)
Other income (expense) 36,987 6,487 (4,660)
INCOME (LOSS) BEFORE TAXES 1,545,621 585,349 1,098,987
Reinsurance [Member]      
Segment Reporting Information [Line Items]      
Gross written premium 9,067,292 7,281,716 6,355,889
Net written premiums 8,535,618 6,767,579 5,732,272
Premiums earned 7,757,483 6,466,106 5,491,296
Incurred losses and LAE 5,556,444 4,933,411 3,675,178
Commission and brokerage 1,854,466 1,552,371 1,400,247
Other underwriting expenses 199,148 175,734 160,834
Underwriting gain (loss) 147,426 (195,410) 255,037
Insurance [Member]      
Segment Reporting Information [Line Items]      
Gross written premium 3,982,464 3,200,645 2,777,475
Net written premiums 2,909,886 2,349,404 2,092,152
Premiums earned 2,648,957 2,215,407 1,912,390
Incurred losses and LAE 1,834,809 1,617,426 1,247,720
Commission and brokerage 354,300 320,879 303,479
Other underwriting expenses 383,499 335,503 280,065
Underwriting gain (loss) $ 76,349 $ (58,401) $ 81,126