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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ (80,199) | $ (46,187) | $ (111,432) | $ 14,047
NET INCOME (LOSS) | 679,982 | 190,880 | 1,021,844 | 207,492
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) | 3,118 | (6,849) | (424) | 31,328
Income tax expense (benefit) | (1,528) | (408) | (1,652) | (7,186)
NET INCOME (LOSS) | 1,590 | (7,257) | (2,076) | 24,142
Benefit Plan Net Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other underwriting expenses | 2,586 | 2,286 | 5,172 | 3,451
Income tax expense (benefit) | (543) | (480) | (1,086) | (725)
NET INCOME (LOSS) | $ 2,043 | $ 1,806 | $ 4,086 | $ 2,726

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