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Segment Reporting (Tables) | 6 Months Ended
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Jun. 30, 2019
Segment Reporting [Abstract] |
Schedule Of Underwriting Results For Operating Segments |
| Three Months Ended |  | Six Months Ended
U.S. Reinsurance | June 30, |  | June 30,
(Dollars in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Gross written premiums | $ | 641,764 |  | $ | 652,109 |  | $ | 1,405,910 |  | $ | 1,296,331
Net written premiums |  | 506,840 |  |  | 566,303 |  |  | 1,176,547 |  |  | 1,112,134
Premiums earned | $ | 620,780 |  | $ | 603,884 |  | $ | 1,247,251 |  | $ | 1,167,269
Incurred losses and LAE |  | 351,725 |  |  | 509,653 |  |  | 671,829 |  |  | 1,054,846
Commission and brokerage |  | 172,602 |  |  | 148,712 |  |  | 339,704 |  |  | 276,032
Other underwriting expenses |  | 15,727 |  |  | 15,472 |  |  | 31,318 |  |  | 32,358
Underwriting gain (loss) | $ | 80,726 |  | $ | (69,953) |  | $ | 204,400 |  | $ | (195,967)
| Three Months Ended |  | Six Months Ended
International | June 30, |  | June 30,
(Dollars in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Gross written premiums | $ | 372,861 |  | $ | 399,024 |  | $ | 772,915 |  | $ | 765,748
Net written premiums |  | 357,917 |  |  | 355,309 |  |  | 733,422 |  |  | 700,464
Premiums earned | $ | 360,075 |  | $ | 363,795 |  | $ | 711,010 |  | $ | 707,399
Incurred losses and LAE |  | 212,972 |  |  | 301,406 |  |  | 467,107 |  |  | 428,430
Commission and brokerage |  | 88,170 |  |  | 92,088 |  |  | 169,595 |  |  | 174,265
Other underwriting expenses |  | 9,835 |  |  | 10,349 |  |  | 18,516 |  |  | 20,925
Underwriting gain (loss) | $ | 49,098 |  | $ | (40,048) |  | $ | 55,792 |  | $ | 83,779
|  | Three Months Ended |  | Six Months Ended
Bermuda | June 30, |  | June 30,
(Dollars in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Gross written premiums | $ | 394,962 |  | $ | 369,440 |  | $ | 762,813 |  | $ | 785,126
Net written premiums |  | 369,929 |  |  | 355,236 |  |  | 719,270 |  |  | 750,204
Premiums earned | $ | 362,905 |  | $ | 353,698 |  | $ | 693,018 |  | $ | 672,832
Incurred losses and LAE |  | 218,385 |  |  | 250,097 |  |  | 416,344 |  |  | 379,610
Commission and brokerage |  | 84,606 |  |  | 80,318 |  |  | 158,716 |  |  | 161,805
Other underwriting expenses |  | 11,868 |  |  | 10,762 |  |  | 23,365 |  |  | 20,895
Underwriting gain (loss) | $ | 48,046 |  | $ | 12,521 |  | $ | 94,593 |  | $ | 110,522
| Three Months Ended |  | Six Months Ended
Insurance | June 30, |  | June 30,
(Dollars in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Gross written premiums | $ | 757,068 |  | $ | 645,948 |  | $ | 1,352,125 |  | $ | 1,150,923
Net written premiums |  | 549,297 |  |  | 469,530 |  |  | 1,006,442 |  |  | 855,782
Premiums earned | $ | 473,539 |  | $ | 408,441 |  | $ | 898,717 |  | $ | 801,745
Incurred losses and LAE |  | 311,548 |  |  | 280,158 |  |  | 587,900 |  |  | 535,605
Commission and brokerage |  | 75,572 |  |  | 62,284 |  |  | 142,409 |  |  | 128,939
Other underwriting expenses |  | 67,403 |  |  | 56,516 |  |  | 130,619 |  |  | 115,205
Underwriting gain (loss) | $ | 19,016 |  | $ | 9,483 |  | $ | 37,789 |  | $ | 21,996
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Underwriting gain (loss) | $ | 196,886 |  | $ | (87,997) |  | $ | 392,574 |  | $ | 20,330
Net investment income |  | 179,028 |  |  | 141,322 |  |  | 320,004 |  |  | 279,616
Net realized capital gains (losses) |  | 30,272 |  |  | 15,776 |  |  | 122,504 |  |  | (9,125)
Net derivative gain (loss) |  | 353 |  |  | 2,987 |  |  | 3,584 |  |  | 3,260
Corporate expenses |  | (7,535) |  |  | (6,633) |  |  | (14,187) |  |  | (15,629)
Interest, fee and bond issue cost amortization expense |  | (8,434) |  |  | (7,728) |  |  | (16,065) |  |  | (15,146)
Other income (expense) |  | (7,977) |  |  | 3,036 |  |  | (17,030) |  |  | 15,100
Income (loss) before taxes | $ | 382,593 |  | $ | 60,763 |  | $ | 791,384 |  | $ | 278,406
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
United Kingdom gross written premium | $ | 207,140 |  | $ | 177,072 |  | $ | 470,997 |  | $ | 435,331

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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