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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 3 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 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net realized gains (losses) |  |  |  |  |  |  |  |  | $ 23,071 | $ (25,554) | $ 6,359
Net investment income | $ 57,594 | $ 55,826 | $ 58,505 | $ 50,618 | $ 54,109 | $ 52,443 | $ 45,553 | $ 43,231 | 222,543 | 195,336 | 161,882
Income before federal income tax | 101,293 | 71,178 | 90,225 | 73,694 | 52,135 | 67,130 | 72,525 | 19,931 | 336,390 | 211,721 | 261,968
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 64,767 | 32,782 | 93,142
Net income | $ 81,859 | $ 56,150 | $ 72,266 | $ 61,348 | $ 45,760 | $ 55,435 | $ 58,819 | $ 18,925 | 271,623 | 178,939 | 168,826
Loss and loss expense incurred |  |  |  |  |  |  |  |  | 1,551,491 | 1,498,134 | 1,345,074
Policy acquisition costs |  |  |  |  |  |  |  |  | 358,069 | 331,318 | 333,097
Total defined benefit pension and post-retirement plans |  |  |  |  |  |  |  |  | (8,799) | (7,226) | $ (2,333)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 2,583 | 33,083 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retirement Income Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Income before federal income tax |  |  |  |  |  |  |  |  | 2,657 | 2,127 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (558) | (447) |
Net income |  |  |  |  |  |  |  |  | 2,099 | 1,680 |
Loss and loss expense incurred |  |  |  |  |  |  |  |  | 582 | 450 |
Policy acquisition costs |  |  |  |  |  |  |  |  | 2,075 | 1,677 |
Held-to-maturity Securities [Member] | Accumulated net investment gain (loss) including portion attributable to noncontrolling interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) |  |  |  |  |  |  |  |  | (46) | 137 |
Net investment income |  |  |  |  |  |  |  |  | (12) | (27) |
Income before federal income tax |  |  |  |  |  |  |  |  | (58) | 110 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 12 | (23) |
Net income |  |  |  |  |  |  |  |  | (46) | 87 |
Available-for-sale Securities [Member] | Accumulated net investment gain (loss) including portion attributable to noncontrolling interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) |  |  |  |  |  |  |  |  | 671 | 39,641 |
Income before federal income tax |  |  |  |  |  |  |  |  | 671 | 39,641 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (141) | (8,325) |
Net income |  |  |  |  |  |  |  |  | $ 530 | $ 31,316 |

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