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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Underwriting gain (loss) | $ 50,943 | $ 196,886 | $ 79,535 | $ 392,574
Net investment income | 38,083 | 179,028 | 185,883 | 320,004
Net realized capital gains (losses) | 184,648 | 30,272 | (25,940) | 122,504
Net derivative gain (loss) | 11,869 | 353 | (3,504) | 3,584
Corporate expenses | (8,733) | (7,535) | (18,566) | (14,187)
Interest, fee and bond issue cost amortization expense | (7,253) | (8,434) | (14,836) | (16,065)
Other income (expense) | (32,490) | (18,225) | (9,127) | (21,525)
INCOME (LOSS) BEFORE TAXES | $ 237,067 | $ 372,345 | $ 193,445 | $ 786,889

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