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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax expense (benefit) | $ (59,891) | $ (7,325)
NET INCOME (LOSS) | 348,900 | 210,318
URA(D) On Securities [Member] | Reclassification From Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other net realized capital gains (losses) | (2,736) | (10,325)
Income tax expense (benefit) | 914 | 1,553
NET INCOME (LOSS) | (1,822) | (8,772)
Benefit Plan Net Actuarial Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other underwriting expenses | 1,457 | 2,298
Income tax expense (benefit) | (306) | (483)
NET INCOME (LOSS) | $ 1,151 | $ 1,815

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