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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ (39,738) | $ 9,132 | $ (99,629) | $ 1,807
NET INCOME (LOSS) | 342,855 | 69,895 | 691,755 | 280,213
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) | (787) | 350 | (3,523) | (9,975)
Income tax expense (benefit) | (1,082) | (101) | (168) | 1,452
NET INCOME (LOSS) | (1,869) | 249 | (3,691) | (8,523)
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 net realized capital gains (losses) | 1,457 | 2,297 | 2,914 | 4,595
Income tax expense (benefit) | (306) | (482) | (612) | (965)
NET INCOME (LOSS) | $ 1,151 | $ 1,815 | $ 2,302 | $ 3,630

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