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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Realized investment (losses) gains                 $ (4,937) $ 13,171 $ 26,599
Net investment income $ 35,428 $ 33,375 $ 31,182 $ 30,769 $ 30,108 $ 32,061 $ 32,230 $ 26,917 130,754 121,316 138,708
Income from continuing operations, before federal income tax                 219,955 232,692 197,131
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax                 5,617 (9,515) 52,234
Income Tax Expense (Benefit)                 (61,460) (66,831) (55,304)
Net income $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 45,389 $ 46,996 $ 33,768 $ 39,708 158,495 165,861 141,827
Losses and loss expenses incurred                 1,234,797 1,148,541 1,157,501
Policy acquisition costs                 763,758 689,820 624,470
Total defined benefit pension and post-retirement plans                 (3,652) 6,185 $ (33,953)
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Net income                 7,310 (4,655)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retirement Income Plan [Member]                      
Income from continuing operations, before federal income tax                 6,462 7,077  
Income Tax Expense (Benefit)                 (2,262) (2,477)  
Net income                 4,200 4,600  
Losses and loss expenses incurred                 1,486 1,538  
Policy acquisition costs                 4,976 5,539  
Accumulated other-than-temporary impairments including portion attributable to noncontrolling interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Realized investment (losses) gains                 213 357  
Income from continuing operations, before federal income tax                 213 357  
Income Tax Expense (Benefit)                 (75) (125)  
Net income                 138 232  
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 (losses) gains                 169 308  
Net investment income                 (310) (888)  
Income from continuing operations, before federal income tax                 (141) (580)  
Income Tax Expense (Benefit)                 49 203  
Net income                 (92) (377)  
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 (losses) gains                 4,713 (14,016)  
Income from continuing operations, before federal income tax                 4,713 (14,016)  
Income Tax Expense (Benefit)                 (1,649) 4,906  
Net income                 $ 3,064 $ (9,110)