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Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting gain (loss) |  |  |  |  |  |  |  |  |  |  |  | $ 336,163 | $ (610,275) | $ (207,521)
Net Investment Income | $ 146,077 | $ 181,058 | $ 179,028 | $ 140,976 | $ 140,204 | $ 161,363 | $ 141,322 | $ 138,294 |  |  |  | 647,139 | 581,183 | 542,898
Net realized capital gains (losses) | $ 75,443 | $ (12,943) | 30,272 | 92,232 | $ (172,815) | 54,804 | 15,776 | (24,901) |  |  |  | 185,004 | (127,136) | 153,194
Net derivative gain (loss) |  |  |  |  |  |  |  |  |  |  |  | 6,374 | 520 | 9,581
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  | (32,966) | (30,672) | (25,923)
Other income (expense) |  |  | (18,225) | (3,300) |  | (13,408) | (6,573) | 17,033 | $ (21,525) | $ 10,460 | $ (2,948) | (11,034) | (24,771) | (21,215)
INCOME (LOSS) BEFORE TAXES |  |  | $ 372,345 | $ 414,544 |  | $ 189,471 | $ 51,154 | $ 222,612 | $ 786,889 | $ 273,766 | $ 463,237 | $ 1,098,987 | $ (242,182) | $ 419,411

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: 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(8)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + 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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