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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
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Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Underwriting gain (loss) | $ 45,204 | $ 28,592
Net investment income | 260,413 | 147,800
Net realized capital gains (losses) | 38,902 | (210,588)
Corporate expenses | (12,378) | (9,833)
Interest, fee and bond issue cost amortization expense | (15,639) | (7,583)
Other income (expense) | 56,593 | 7,990
Income (loss) before taxes | $ 373,095 | $ (43,622)

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