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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Total net realized gains $ 6,798 $ 3,688 $ 7,487 $ 2,749
Net investment income 40,446 33,375 119,295 95,326
Losses and loss expenses incurred 344,587 316,258 1,003,618 911,881
Policy acquisition costs 194,635 193,835 587,687 567,793
Income before federal income tax 67,315 55,443 193,818 169,629
Total federal income tax expense (20,597) (16,941) (55,234) (50,494)
Net income 46,718 38,502 138,584 119,135
Reclassification out of AOCI        
Net income (4,075) (1,354) (3,719) 1,167
Pension Plan [Member] | Reclassification out of AOCI        
Losses and loss expenses incurred 110 351 331 1,009
Policy acquisition costs 397 1,264 1,191 3,639
Income before federal income tax 507 1,615 1,522 4,648
Total federal income tax expense (178) (565) (533) (1,627)
Net income 329 1,050 989 3,021
Non Credit OTTI On Disposed Securities [Member] | Reclassification out of AOCI        
Total net realized gains (38) 0 (38) 0
Income before federal income tax 38 0 38 0
Total federal income tax expense (13) 0 (13) 0
Net income 25 0 25 0
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Total net realized gains 11 73 41 161
Net investment income (65) (86) (187) (265)
Income before federal income tax (54) (13) (146) (104)
Total federal income tax expense 19 4 51 36
Net income (35) (9) (95) (68)
Available-for-sale Securities [Member] | Reclassification out of AOCI        
Total net realized gains (6,760) (3,684) (7,135) (2,747)
Income before federal income tax (6,760) (3,684) (7,135) (2,747)
Total federal income tax expense 2,366 1,289 2,497 961
Net income $ (4,394) $ (2,395) $ (4,638) $ (1,786)