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Segment Reporting (Tables) | 6 Months Ended
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Jun. 30, 2020
Segment Reporting [Abstract] |
Schedule Of Underwriting Results For Operating Segments |
| Three Months Ended |  | Six Months Ended
Reinsurance | June 30, |  | June 30,
(Dollars in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Gross written premiums | $ | 1,538,348 |  | $ | 1,409,587 |  | $ | 3,316,119 |  | $ | 2,941,638
Net written premiums |  | 1,424,089 |  |  | 1,234,686 |  |  | 3,037,183 |  |  | 2,629,239
Premiums earned | $ | 1,502,256 |  | $ | 1,343,760 |  | $ | 2,987,476 |  | $ | 2,651,279
Incurred losses and LAE |  | 1,005,677 |  |  | 783,082 |  |  | 2,026,319 |  |  | 1,555,280
Commission and brokerage |  | 387,339 |  |  | 345,378 |  |  | 757,695 |  |  | 668,015
Other underwriting expenses |  | 39,698 |  |  | 37,430 |  |  | 83,837 |  |  | 73,199
Underwriting gain (loss) | $ | 69,542 |  | $ | 177,870 |  | $ | 119,625 |  | $ | 354,785
| Three Months Ended |  | Six Months Ended
Insurance | June 30, |  | June 30,
(Dollars in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Gross written premiums | $ | 830,990 |  | $ | 757,068 |  | $ | 1,624,090 |  | $ | 1,352,125
Net written premiums |  | 593,389 |  |  | 549,297 |  |  | 1,181,774 |  |  | 1,006,442
Premiums earned | $ | 540,149 |  | $ | 473,539 |  | $ | 1,091,743 |  | $ | 898,717
Incurred losses and LAE |  | 401,339 |  |  | 311,548 |  |  | 811,537 |  |  | 587,900
Commission and brokerage |  | 78,977 |  |  | 75,572 |  |  | 157,143 |  |  | 142,409
Other underwriting expenses |  | 78,432 |  |  | 67,403 |  |  | 163,153 |  |  | 130,619
Underwriting gain (loss) | $ | (18,599) |  | $ | 19,016 |  | $ | (40,090) |  | $ | 37,789
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) | 2020 |  | 2019 |  | 2020 |  | 2019
Underwriting gain (loss) | $ | 50,943 |  | $ | 196,886 |  | $ | 79,535 |  | $ | 392,574
Net investment income |  | 38,083 |  |  | 179,028 |  |  | 185,883 |  |  | 320,004
Net realized capital gains (losses) |  | 184,648 |  |  | 30,272 |  |  | (25,940) |  |  | 122,504
Net derivative gain (loss) |  | 11,869 |  |  | 353 |  |  | (3,504) |  |  | 3,584
Corporate expenses |  | (8,733) |  |  | (7,535) |  |  | (18,566) |  |  | (14,187)
Interest, fee and bond issue cost amortization expense |  | (7,253) |  |  | (8,434) |  |  | (14,836) |  |  | (16,065)
Other income (expense) |  | (32,490) |  |  | (18,225) |  |  | (9,127) |  |  | (21,525)
Income (loss) before taxes | $ | 237,067 |  | $ | 372,345 |  | $ | 193,445 |  | $ | 786,889
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) | 2020 |  | 2019 |  | 2020 |  | 2019
United Kingdom gross written premium | $ | 236,100 |  | $ | 207,140 |  | $ | 542,808 |  | $ | 470,997

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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 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=115929826&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=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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