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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, 2019 | Mar. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Net investment income | $ 140,976 | $ 138,294
Net realized capital gains (losses) | 92,232 | (24,901)
Net derivative gain (loss) | 3,231 | 273
Corporate expenses | (6,652) | (8,996)
Interest, fee and bond issue cost amortization expense | (7,631) | (7,418)
Other income (expense) | (9,053) | 12,064
INCOME (LOSS) BEFORE TAXES | 408,791 | 217,643
Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Underwriting gain (loss) | 195,688 | 108,327
Net investment income | 140,976 | 138,294
Net realized capital gains (losses) | 92,232 | (24,901)
Net derivative gain (loss) | 3,231 | 273
Corporate expenses | (6,652) | (8,996)
Interest, fee and bond issue cost amortization expense | (7,631) | (7,418)
Other income (expense) | (9,053) | 12,064
INCOME (LOSS) BEFORE TAXES | $ 408,791 | $ 217,643

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