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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Premiums earned $ 1,905,619 $ 1,731,479 $ 5,455,615 $ 5,080,724
Incurred losses and LAE 1,371,924 1,251,858 3,515,104 3,650,349
Commission and brokerage 443,076 381,401 1,253,500 1,122,442
Other underwriting expenses 118,158 97,942 321,976 287,325
Underwriting gain (loss) (27,539) 278 365,035 20,608
U.S. Reinsurance [Member]        
Segment Reporting Information [Line Items]        
Gross written premiums 852,679 940,839 2,258,589 2,237,170
Net written premiums 754,477 845,743 1,931,024 1,957,877
Premiums earned 646,265 670,663 1,893,516 1,837,932
Incurred losses and LAE 380,960 440,070 1,052,789 1,494,916
Commission and brokerage 215,813 156,500 555,517 432,532
Other underwriting expenses 19,150 16,250 50,468 48,608
Underwriting gain (loss) 30,342 57,843 234,742 (138,124)
International [Member]        
Segment Reporting Information [Line Items]        
Gross written premiums 442,294 362,651 1,215,209 1,128,399
Net written premiums 407,897 348,785 1,141,319 1,049,249
Premiums earned 372,344 342,238 1,083,354 1,049,637
Incurred losses and LAE 411,011 310,400 878,118 738,830
Commission and brokerage 83,420 81,439 253,015 255,704
Other underwriting expenses 11,331 10,191 29,847 31,116
Underwriting gain (loss) (133,418) (59,792) (77,626) 23,987
Bermuda [Member]        
Segment Reporting Information [Line Items]        
Gross written premiums 441,699 377,916 1,204,512 1,163,042
Net written premiums 421,339 358,758 1,140,609 1,108,962
Premiums earned 402,190 299,815 1,095,208 972,647
Incurred losses and LAE 258,650 211,718 674,994 591,328
Commission and brokerage 71,865 76,611 230,581 238,416
Other underwriting expenses 13,351 10,752 36,716 31,647
Underwriting gain (loss) 58,324 734 152,917 111,256
Insurance [Member]        
Segment Reporting Information [Line Items]        
Gross written premiums 666,602 517,258 2,018,727 1,668,181
Net written premiums 484,844 385,487 1,491,286 1,241,269
Premiums earned 484,820 418,763 1,383,537 1,220,508
Incurred losses and LAE 321,303 289,670 909,203 825,275
Commission and brokerage 71,978 66,851 214,387 195,790
Other underwriting expenses 74,326 60,749 204,945 175,954
Underwriting gain (loss) $ 17,213 $ 1,493 $ 55,002 $ 23,489