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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

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- Definition The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis. + References No definition available. + Details
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