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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