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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Total net realized gains $ 3,688 $ 308 $ 2,749 $ 15,771
Net investment income 33,375 32,061 95,326 91,208
Loss and loss expense incurred 316,258 285,161 911,881 861,721
Policy acquisition costs 193,835 174,802 567,793 509,295
Income before federal income tax 55,443 65,839 169,629 168,894
Total federal income tax expense (16,941) (18,843) (50,494) (48,422)
Net income 38,502 46,996 119,135 120,472
Reclassification out of AOCI        
Net income (1,354) 848 1,167 (7,695)
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 351 371 1,009 1,114
Policy acquisition costs 1,264 1,338 3,639 4,013
Income before federal income tax 1,615 1,709 4,648 5,127
Total federal income tax expense (565) (599) (1,627) (1,795)
Net income 1,050 1,110 3,021 3,332
Non-credit OTTI on Disposed Securities [Member] | Reclassification out of AOCI        
Total net realized gains 0 0 0 357
Income before federal income tax 0 0 0 357
Total federal income tax expense 0 0 0 (125)
Net income 0 0 0 232
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Total net realized gains 73 121 161 258
Net investment income (86) (218) (265) (801)
Income before federal income tax (13) (97) (104) (543)
Total federal income tax expense 4 34 36 190
Net income (9) (63) (68) (353)
Available-for-sale Securities [Member] | Reclassification out of AOCI        
Total net realized gains (3,684) (305) (2,747) (16,778)
Income before federal income tax (3,684) (305) (2,747) (16,778)
Total federal income tax expense 1,289 106 961 5,872
Net income $ (2,395) $ (199) $ (1,786) $ (10,906)