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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2019
Segment Reporting [Abstract] |
Schedule Of Underwriting Results For Operating Segments |
U.S. Reinsurance | Years Ended December 31,
(Dollars in thousands) | 2019 |  | 2018 |  | 2017
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 | Years Ended December 31,
(Dollars in thousands) | 2019 |  | 2018 |  | 2017
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 | Years Ended December 31,
(Dollars in thousands) | 2019 |  | 2018 |  | 2017
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 | Years Ended December 31,
(Dollars in thousands) | 2019 |  | 2018 |  | 2017
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)
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes |
| Years Ended December 31,
(Dollars in thousands) | 2019 |  | 2018 |  | 2017
Underwriting gain (loss) | $ | 336,163 |  | $ | (610,275) |  | $ | (207,521)
Net investment income |  | 647,139 |  |  | 581,183 |  |  | 542,898
Net realized capital gains (losses) |  | 185,004 |  |  | (127,136) |  |  | 153,194
Net derivative gain (loss) |  | 6,374 |  |  | 520 |  |  | 9,581
Corporate expenses |  | (32,966) |  |  | (30,672) |  |  | (25,923)
Interest, fee and bond issue cost amortization expense |  | (31,693) |  |  | (31,031) |  |  | (31,603)
Other income (expense) |  | (11,034) |  |  | (24,771) |  |  | (21,215)
Income (loss) before taxes | $ | 1,098,987 |  | $ | (242,182) |  | $ | 419,411
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market |
| Year Ended December 31,
(Dollars in thousands) | 2019 |  | 2018 |  | 2017
United Kingdom gross written premium | $ | 964,358 |  | $ | 914,612 |  | $ | 730,826

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- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8924-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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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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