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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Underwriting gain (loss) | $ 196,886 | $ (87,997) | $ 392,574 | $ 20,330
Net investment income | 179,028 | 141,322 | 320,004 | 279,616
Net realized capital gains (losses) | 30,272 | 15,776 | 122,504 | (9,125)
Net derivative gain (loss) | 353 | 2,987 | 3,584 | 3,260
Corporate expenses | (7,535) | (6,633) | (14,187) | (15,629)
Interest, fee and bond issue cost amortization expense | (8,434) | (7,728) | (16,065) | (15,146)
Other income (expense) | (7,977) | 3,036 | (17,030) | 15,100
INCOME (LOSS) BEFORE TAXES | $ 382,593 | $ 60,763 | $ 791,384 | $ 278,406

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