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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Schedule Of Underwriting Results For Operating Segments |
Reinsurance | Years Ended December 31,
(Dollars in thousands) | 2020 |  | 2019 |  | 2018
Gross written premiums | $ | 7,281,716 |  | $ | 6,355,889 |  | $ | 6,224,601
Net written premiums |  | 6,767,579 |  |  | 5,732,272 |  |  | 5,706,453
Premiums earned | $ | 6,466,106 |  | $ | 5,491,296 |  | $ | 5,293,071
Incurred losses and LAE |  | 4,933,411 |  |  | 3,675,178 |  |  | 4,585,602
Commission and brokerage |  | 1,552,371 |  |  | 1,400,247 |  |  | 1,251,581
Other underwriting expenses |  | 175,734 |  |  | 160,834 |  |  | 142,874
Underwriting gain (loss) | $ | (195,410) |  | $ | 255,037 |  | $ | (686,986)
Insurance | Years Ended December 31,
(Dollars in thousands) | 2020 |  | 2019 |  | 2018
Gross written premiums | $ | 3,200,645 |  | $ | 2,777,475 |  | $ | 2,250,552
Net written premiums |  | 2,349,404 |  |  | 2,092,152 |  |  | 1,707,975
Premiums earned | $ | 2,215,407 |  | $ | 1,912,390 |  | $ | 1,638,628
Incurred losses and LAE |  | 1,617,426 |  |  | 1,247,720 |  |  | 1,065,801
Commission and brokerage |  | 320,879 |  |  | 303,479 |  |  | 267,449
Other underwriting expenses |  | 335,503 |  |  | 280,065 |  |  | 228,667
Underwriting gain (loss) | $ | (58,401) |  | $ | 81,126 |  | $ | 76,711
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes |
| Years Ended December 31,
(Dollars in thousands) | 2020 |  | 2019 |  | 2018
Underwriting gain (loss) | $ | (253,811) |  | $ | 336,163 |  | $ | (610,275)
Net investment income |  | 642,465 |  |  | 647,139 |  |  | 581,183
Net realized capital gains (losses) |  | 267,649 |  |  | 185,004 |  |  | (127,136)
Corporate expenses |  | (41,118) |  |  | (32,966) |  |  | (30,672)
Interest, fee and bond issue cost amortization expense |  | (36,323) |  |  | (31,693) |  |  | (31,031)
Other income (expense) |  | 6,487 |  |  | (4,660) |  |  | (24,251)
Income (loss) before taxes | $ | 585,349 |  | $ | 1,098,987 |  | $ | (242,182)
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market |
| Year Ended December 31,
(Dollars in thousands) | 2020 |  | 2019 |  | 2018
United Kingdom gross written premium | $ | 1,116,363 |  | $ | 964,358 |  | $ | 914,612

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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=120311839&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=120311839&loc=d3e8906-108599 + Details
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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 + 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=120311839&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=120311839&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=120311839&loc=d3e8906-108599 + Details
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