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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Underwriting gain (loss) |  |  |  |  |  |  |  |  | $ (253,811) | $ 336,163 | $ (610,275)
Net Investment Income | $ 222,349 | $ 234,233 | $ 38,083 | $ 147,800 | $ 146,077 | $ 181,058 | $ 179,028 | $ 140,976 | 642,465 | 647,139 | 581,183
Net realized capital gains (losses) | $ 183,386 | $ 110,203 | $ 184,648 | $ (210,588) | $ 75,443 | $ (12,943) | $ 30,272 | $ 92,232 | 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)

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