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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ (46,187) | $ (39,477) | $ 14,047 | $ (99,470)
NET INCOME (LOSS) | 190,880 | 332,868 | 207,492 | 687,419
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) | (6,849) | (787) | 31,328 | (3,523)
Income tax expense (benefit) | (408) | (1,082) | (7,186) | (168)
NET INCOME (LOSS) | (7,257) | (1,869) | 24,142 | (3,691)
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 | 2,286 | 1,457 | 3,451 | 2,914
Income tax expense (benefit) | (480) | (306) | (725) | (612)
NET INCOME (LOSS) | $ 1,806 | $ 1,151 | $ 2,726 | $ 2,302

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