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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Premiums earned | $ 2,558,372 | $ 2,042,405 | $ 4,946,237 | $ 4,079,219
Incurred losses and LAE | 1,586,141 | 1,407,016 | 3,297,560 | 2,837,856
Commission and brokerage | 557,749 | 466,316 | 1,046,760 | 914,838
Other underwriting expenses | 140,844 | 118,130 | 283,075 | 246,990
Underwriting gain (loss) | 273,639 | 50,943 | 318,843 | 79,535
U.S. Reinsurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premium | 2,148,235 | 1,538,348 | 4,207,250 | 3,316,119
Net written premiums | 2,059,919 | 1,424,089 | 3,972,868 | 3,037,183
Premiums earned | 1,920,801 | 1,502,256 | 3,698,253 | 2,987,476
Incurred losses and LAE | 1,168,139 | 1,005,677 | 2,440,045 | 2,026,319
Commission and brokerage | 473,258 | 387,339 | 881,982 | 757,695
Other underwriting expenses | 47,065 | 39,698 | 99,061 | 83,837
Underwriting gain (loss) | 232,339 | 69,542 | 277,165 | 119,625
Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premium | 1,041,905 | 830,990 | 1,914,323 | 1,624,090
Net written premiums | 749,492 | 593,389 | 1,390,479 | 1,181,774
Premiums earned | 637,571 | 540,149 | 1,247,984 | 1,091,743
Incurred losses and LAE | 418,002 | 401,339 | 857,515 | 811,537
Commission and brokerage | 84,490 | 78,977 | 164,777 | 157,143
Other underwriting expenses | 93,779 | 78,432 | 184,014 | 163,153
Underwriting gain (loss) | $ 41,300 | $ (18,599) | $ 41,678 | $ (40,090)

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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 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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