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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Gross written premium $ 3,186,351 $ 2,931,433
Net written premiums 2,812,013 2,553,937
Premiums earned 2,791,765 2,387,865
Incurred losses and LAE 1,789,863 1,711,419
Commission and brokerage 605,230 489,011
Other underwriting expenses 161,293 142,231
Underwriting gain (loss) 235,379 45,204
Net investment income 242,830 260,413
Net gains (losses) (153,627) 38,902
Corporate expenses (14,020) (12,378)
Interest, fee and bond issue cost amortization expense (24,078) (15,639)
Other income (expense) 15,363 56,593
INCOME (LOSS) BEFORE TAXES 301,847 373,095
Reinsurance [Member]    
Segment Reporting Information [Line Items]    
Gross written premium 2,185,612 2,059,015
Net written premiums 2,081,449 1,912,950
Premiums earned 2,066,254 1,777,452
Incurred losses and LAE 1,324,716 1,271,906
Commission and brokerage 514,243 408,724
Other underwriting expenses 50,453 51,996
Underwriting gain (loss) 176,842 44,826
Insurance [Member]    
Segment Reporting Information [Line Items]    
Gross written premium 1,000,739 872,418
Net written premiums 730,564 640,987
Premiums earned 725,511 610,413
Incurred losses and LAE 465,147 439,513
Commission and brokerage 90,987 80,287
Other underwriting expenses 110,840 90,235
Underwriting gain (loss) $ 58,537 $ 378