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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2021
Segment Reporting [Abstract] |
Schedule Of Underwriting Results For Operating Segments |
| Year Ended December 31, 2021
(Dollars in thousands) | Reinsurance |  | Insurance |  | Total
Gross written premiums | $ | 9,067,292 |  | $ | 3,982,464 |  | $ | 13,049,756
Net written premiums |  | 8,535,618 |  |  | 2,909,886 |  |  | 11,445,505
Premiums earned | $ | 7,757,483 |  | $ | 2,648,957 |  | $ | 10,406,441
Incurred losses and LAE |  | 5,556,444 |  |  | 1,834,809 |  |  | 7,391,253
Commission and brokerage |  | 1,854,466 |  |  | 354,300 |  |  | 2,208,766
Other underwriting expenses |  | 199,148 |  |  | 383,499 |  |  | 582,647
Underwriting gain (loss) | $ | 147,426 |  | $ | 76,349 |  | $ | 223,775
Net investment income |  |  |  |  |  |  |  | 1,164,892
Net realized capital gains (losses) |  |  |  |  |  |  |  | 257,943
Corporate expenses |  |  |  |  |  |  |  | (67,827)
Interest, fee and bond issue cost amortization expense |  |  |  |  |  |  |  | (70,149)
Other income (expense) |  |  |  |  |  |  |  | 36,987
Income (loss) before taxes |  |  |  |  |  |  | $ | 1,545,621
| Year Ended December 31, 2020
(Dollars in thousands) | Reinsurance |  | Insurance |  | Total
Gross written premiums | $ | 7,281,716 |  | $ | 3,200,645 |  | $ | 10,482,361
Net written premiums |  | 6,767,579 |  |  | 2,349,404 |  |  | 9,116,983
Premiums earned | $ | 6,466,106 |  | $ | 2,215,407 |  | $ | 8,681,513
Incurred losses and LAE |  | 4,933,411 |  |  | 1,617,426 |  |  | 6,550,837
Commission and brokerage |  | 1,552,371 |  |  | 320,879 |  |  | 1,873,250
Other underwriting expenses |  | 175,734 |  |  | 335,503 |  |  | 511,237
Underwriting gain (loss) | $ | (195,410) |  | $ | (58,401) |  | $ | (253,811)
Net investment income |  |  |  |  |  |  |  | 642,465
Net realized capital gains (losses) |  |  |  |  |  |  |  | 267,649
Corporate expenses |  |  |  |  |  |  |  | (41,118)
Interest, fee and bond issue cost amortization expense |  |  |  |  |  |  |  | (36,323)
Other income (expense) |  |  |  |  |  |  |  | 6,487
Income (loss) before taxes |  |  |  |  |  |  | $ | 585,349
| Year Ended December 31, 2019
(Dollars in thousands) | Reinsurance |  | Insurance |  | Total
Gross written premiums | $ | 6,355,889 |  | $ | 2,777,475 |  | $ | 9,133,364
Net written premiums |  | 5,732,272 |  |  | 2,092,152 |  |  | 7,824,424
Premiums earned | $ | 5,491,296 |  | $ | 1,912,390 |  | $ | 7,403,686
Incurred losses and LAE |  | 3,675,178 |  |  | 1,247,720 |  |  | 4,922,898
Commission and brokerage |  | 1,400,247 |  |  | 303,479 |  |  | 1,703,726
Other underwriting expenses |  | 160,834 |  |  | 280,065 |  |  | 440,899
Underwriting gain (loss) | $ | 255,037 |  | $ | 81,126 |  | $ | 336,163
Net investment income |  |  |  |  |  |  |  | 647,139
Net realized capital gains (losses) |  |  |  |  |  |  |  | 185,004
Corporate expenses |  |  |  |  |  |  |  | (32,966)
Interest, fee and bond issue cost amortization expense |  |  |  |  |  |  |  | (31,693)
Other income (expense) |  |  |  |  |  |  |  | (4,660)
Income (loss) before taxes |  |  |  |  |  |  | $ | 1,098,987
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market |
| Year Ended December 31,
(Dollars in thousands) | 2021 |  | 2020 |  | 2019
United Kingdom gross written premium | $ | 1,245,909 |  | $ | 1,116,363 |  | $ | 964,358

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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=123359005&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=123359005&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=123359005&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=123359005&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=121556970&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 30 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 + Details
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