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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ (39,477) | $ (59,993) |  | $ 8,910 | $ 9,633 | $ (7,426) | $ (99,470) | $ 2,207 | $ 11,117 | $ (89,526) | $ 331,223 | $ 63,340
NET INCOME (LOSS) | $ 217,644 | $ 104,398 | $ 332,868 | $ 354,551 | $ (385,313) | $ 198,381 | $ 60,787 | $ 215,186 | $ 687,419 | $ 275,973 | $ 474,354 | 1,009,461 | 89,041 | $ 482,751
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) |  |  |  |  |  |  |  |  |  |  |  | (13,129) | 28,014 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 516 | (518) |
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |  | (12,613) | 27,496 |
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 |  |  |  |  |  |  |  |  |  |  |  | 6,902 | 6,356 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | (1,449) | (1,335) |
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |  | $ 5,453 | $ 5,021 |

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