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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Realized investment gains (losses) |  |  |  |  |  |  |  |  | $ 6,359 | $ (4,937) | $ 13,171
Net investment income | $ 42,587 | $ 40,446 | $ 41,430 | $ 37,419 | $ 35,428 | $ 33,375 | $ 31,182 | $ 30,769 | 161,882 | 130,754 | 121,316
Income before federal income tax | 68,150 | 67,315 | 58,929 | 67,574 | 50,326 | 55,443 | 62,311 | 51,875 | 261,968 | 219,955 | 232,692
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (93,142) | (61,460) | (66,831)
Net income | $ 30,242 | $ 46,718 | $ 41,426 | $ 50,440 | $ 39,360 | $ 38,502 | $ 43,601 | $ 37,032 | 168,826 | 158,495 | 165,861
Loss and loss expense incurred |  |  |  |  |  |  |  |  | 1,345,074 | 1,234,797 | 1,148,541
Policy acquisition costs |  |  |  |  |  |  |  |  | 333,097 | 321,395 | 300,359
Total defined benefit pension and post-retirement plans |  |  |  |  |  |  |  |  | (2,333) | (3,652) | $ 6,185
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (3,218) | 7,310 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retirement Income Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Income before federal income tax |  |  |  |  |  |  |  |  | 2,102 | 6,462 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (735) | (2,262) |
Net income |  |  |  |  |  |  |  |  | 1,367 | 4,200 |
Loss and loss expense incurred |  |  |  |  |  |  |  |  | 450 | 1,486 |
Policy acquisition costs |  |  |  |  |  |  |  |  | 1,652 | 4,976 |
Accumulated other-than-temporary impairments including portion attributable to noncontrolling interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Realized investment gains (losses) |  |  |  |  |  |  |  |  | 104 | 213 |
Income before federal income tax |  |  |  |  |  |  |  |  | 104 | 213 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (36) | (75) |
Net income |  |  |  |  |  |  |  |  | 68 | 138 |
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] |  |  |  |  |  |  |  |  |  |  |
Realized investment gains (losses) |  |  |  |  |  |  |  |  | 32 | 169 |
Net investment income |  |  |  |  |  |  |  |  | (211) | (310) |
Income before federal income tax |  |  |  |  |  |  |  |  | (179) | (141) |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 63 | 49 |
Net income |  |  |  |  |  |  |  |  | (116) | (92) |
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] |  |  |  |  |  |  |  |  |  |  |
Realized investment gains (losses) |  |  |  |  |  |  |  |  | (6,979) | 4,713 |
Income before federal income tax |  |  |  |  |  |  |  |  | (6,979) | 4,713 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 2,442 | (1,649) |
Net income |  |  |  |  |  |  |  |  | $ (4,537) | $ 3,064 |

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