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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