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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Premiums earned | $ 2,387,865 | $ 2,036,814
Incurred losses and LAE | 1,711,419 | 1,430,840
Commission and brokerage | 489,011 | 448,522
Other underwriting expenses | 142,231 | 128,860
Underwriting gain (loss) | 45,204 | 28,592
U.S. Reinsurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross written premiums | 2,059,015 | 1,777,771
Net written premiums | 1,912,950 | 1,613,094
Premiums earned | 1,777,452 | 1,485,221
Incurred losses and LAE | 1,271,906 | 1,020,642
Commission and brokerage | 408,724 | 370,356
Other underwriting expenses | 51,996 | 44,139
Underwriting gain (loss) | 44,826 | 50,084
Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Gross written premiums | 872,418 | 793,100
Net written premiums | 640,987 | 588,385
Premiums earned | 610,413 | 551,593
Incurred losses and LAE | 439,513 | 410,198
Commission and brokerage | 80,287 | 78,166
Other underwriting expenses | 90,235 | 84,721
Underwriting gain (loss) | $ 378 | $ (21,492)

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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis. + References No definition available. + Details
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