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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
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Underwriting gain (loss) | $ 273,639 | $ 50,943 | $ 318,843 | $ 79,535
Net investment income | 407,095 | 38,083 | 667,508 | 185,883
Net realized capital gains (losses) | 104,109 | 184,648 | 143,011 | (25,940)
Corporate expenses | (16,168) | (8,733) | (28,546) | (18,566)
Interest, fee and bond issue cost amortization expense | (15,607) | (7,253) | (31,246) | (14,836)
Other income (expense) | 7,114 | (20,621) | 63,707 | (12,631)
INCOME (LOSS) BEFORE TAXES | $ 760,181 | $ 237,067 | $ 1,133,276 | $ 193,445

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