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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net realized (losses) gains                 $ (25,554) $ 6,359 $ (4,937)
Net investment income $ 54,109 [1] $ 52,443 $ 45,553 $ 43,231 $ 42,587 [1] $ 40,446 $ 41,430 $ 37,419 195,336 161,882 130,754
Income before federal income tax 52,135 67,130 72,525 19,931 68,150 67,315 58,929 67,574 211,721 261,968 219,955
Income Tax Expense (Benefit)                 (32,782) (93,142) (61,460)
Net income $ 45,760 [1] $ 55,435 $ 58,819 $ 18,925 $ 30,242 [1] $ 46,718 $ 41,426 $ 50,440 178,939 168,826 158,495
Loss and loss expense incurred                 1,498,134 1,345,074 1,234,797
Policy acquisition costs                 331,318 333,097 321,395
Total defined benefit pension and post-retirement plans                 (7,226) (2,333) $ (3,652)
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Net income                 33,083 (3,218)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retirement Income Plan [Member]                      
Income before federal income tax                 2,127 2,102  
Income Tax Expense (Benefit)                 (447) (735)  
Net income                 1,680 1,367  
Loss and loss expense incurred                 450 450  
Policy acquisition costs                 1,677 1,652  
Accumulated other-than-temporary impairments including portion attributable to noncontrolling interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Net realized (losses) gains                 0 104  
Income before federal income tax                 0 104  
Income Tax Expense (Benefit)                 0 (36)  
Net income                 0 68  
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 (losses) gains                 137 32  
Net investment income                 (27) (211)  
Income before federal income tax                 110 (179)  
Income Tax Expense (Benefit)                 (23) 63  
Net income                 87 (116)  
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 (losses) gains                 39,641 (6,979)  
Income before federal income tax                 39,641 (6,979)  
Income Tax Expense (Benefit)                 (8,325) 2,442  
Net income                 $ 31,316 $ (4,537)  
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.