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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
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ 11,378 | $ (39,477) | $ (59,993) | $ 8,910 | $ 9,633 | $ (7,426) | $ (99,470) | $ 2,207 | $ (88,092) | $ 11,117 | $ 331,223 | $ 63,340
NET INCOME (LOSS) | 104,398 | $ 332,868 | $ 354,551 | 198,381 | $ 60,787 | $ 215,186 | $ 687,419 | $ 275,973 | 791,817 | 474,354 | $ 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) | (74) |  |  | 2,175 |  |  |  |  | (3,597) | (7,800) |  |
Income tax expense (benefit) | (455) |  |  | (758) |  |  |  |  | (623) | 694 |  |
NET INCOME (LOSS) | (529) |  |  | 1,417 |  |  |  |  | (4,220) | (7,106) |  |
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 | 1,726 |  |  | 2,298 |  |  |  |  | 4,640 | 6,893 |  |
Income tax expense (benefit) | (363) |  |  | (482) |  |  |  |  | (975) | (1,447) |  |
NET INCOME (LOSS) | $ 1,363 |  |  | $ 1,816 |  |  |  |  | $ 3,665 | $ 5,446 |  |

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