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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross written premiums |  |  |  |  |  |  |  |  | $ 2,783,036 | $ 2,240,951 | $ 2,083,555
Net written premiums | $ 2,120,186 | $ 2,068,557 | $ 1,783,983 | $ 1,851,698 | $ 2,057,071 | $ 1,938,773 | $ 1,746,378 | $ 1,672,206 | 7,824,424 | 7,414,428 | 6,244,661
Premiums earned | $ 1,948,071 | $ 1,905,619 | $ 1,817,299 | $ 1,732,697 | $ 1,850,975 | $ 1,731,479 | $ 1,729,818 | $ 1,619,427 | 7,403,686 | 6,931,699 | 5,937,840
Incurred losses and LAE |  |  |  |  |  |  |  |  | 4,922,898 | 5,651,403 | 4,522,581
Commission and brokerage |  |  |  |  |  |  |  |  | 1,703,726 | 1,519,030 | 1,303,963
Other underwriting expenses |  |  |  |  |  |  |  |  | 440,899 | 371,541 | 318,817
Underwriting gain (loss) |  |  |  |  |  |  |  |  | 336,163 | (610,275) | (207,521)
U.S. Reinsurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross written premiums |  |  |  |  |  |  |  |  | 2,962,416 | 3,014,338 | 2,592,972
Net written premiums |  |  |  |  |  |  |  |  | 2,513,579 | 2,642,182 | 2,245,422
Premiums earned |  |  |  |  |  |  |  |  | 2,471,447 | 2,528,991 | 2,181,160
Incurred losses and LAE |  |  |  |  |  |  |  |  | 1,514,151 | 2,784,181 | 1,632,795
Commission and brokerage |  |  |  |  |  |  |  |  | 703,803 | 568,374 | 462,487
Other underwriting expenses |  |  |  |  |  |  |  |  | 68,796 | 60,266 | 55,881
Underwriting gain (loss) |  |  |  |  |  |  |  |  | 184,697 | (883,830) | 29,997
International [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross written premiums |  |  |  |  |  |  |  |  | 1,648,598 | 1,543,946 | 1,316,701
Net written premiums |  |  |  |  |  |  |  |  | 1,551,753 | 1,458,745 | 1,229,597
Premiums earned |  |  |  |  |  |  |  |  | 1,475,669 | 1,439,882 | 1,202,043
Incurred losses and LAE |  |  |  |  |  |  |  |  | 1,193,816 | 992,704 | 1,059,640
Commission and brokerage |  |  |  |  |  |  |  |  | 342,400 | 364,010 | 287,688
Other underwriting expenses |  |  |  |  |  |  |  |  | 41,690 | 39,042 | 38,844
Underwriting gain (loss) |  |  |  |  |  |  |  |  | (102,237) | 44,126 | (184,129)
Bermuda [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross written premiums |  |  |  |  |  |  |  |  | 1,744,875 | 1,666,317 | 1,205,001
Net written premiums |  |  |  |  |  |  |  |  | 1,666,940 | 1,605,526 | 1,139,082
Premiums earned |  |  |  |  |  |  |  |  | 1,544,180 | 1,324,198 | 1,093,250
Incurred losses and LAE |  |  |  |  |  |  |  |  | 967,211 | 808,717 | 735,292
Commission and brokerage |  |  |  |  |  |  |  |  | 354,044 | 319,197 | 303,707
Other underwriting expenses |  |  |  |  |  |  |  |  | 50,348 | 43,566 | 38,011
Underwriting gain (loss) |  |  |  |  |  |  |  |  | 172,577 | 152,718 | 16,240
Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross written premiums |  |  |  |  |  |  |  |  | 2,777,475 | 2,250,552 | 2,059,248
Net written premiums |  |  |  |  |  |  |  |  | 2,092,152 | 1,707,975 | 1,630,560
Premiums earned |  |  |  |  |  |  |  |  | 1,912,390 | 1,638,628 | 1,461,387
Incurred losses and LAE |  |  |  |  |  |  |  |  | 1,247,720 | 1,065,801 | 1,094,854
Commission and brokerage |  |  |  |  |  |  |  |  | 303,479 | 267,449 | 250,081
Other underwriting expenses |  |  |  |  |  |  |  |  | 280,065 | 228,667 | 186,081
Underwriting gain (loss) |  |  |  |  |  |  |  |  | $ 81,126 | $ 76,711 | $ (69,629)

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