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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Total net realized and unrealized (losses) gains $ 4,787 $ (6,798) $ 16,988 $ (7,487)
Net investment income 52,443 40,446 141,227 119,295
Loss and loss expense incurred 379,199 344,587 1,130,468 1,003,618
Other insurance expenses 80,108 78,874 244,342 243,799
Income before federal income tax 67,130 67,315 159,586 193,818
Total federal income tax expense (11,695) (20,597) (26,407) (55,234)
Net income 55,435 46,718 133,179 138,584
Reclassification out of AOCI        
Net income 8,977 (4,075) 15,662 (3,719)
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 112 110 337 331
Other insurance expenses 420 397 1,258 1,191
Income before federal income tax 532 507 1,595 1,522
Total federal income tax expense (112) (178) (335) (533)
Net income 420 329 1,260 989
Non Credit OTTI On Disposed Securities [Member] | Reclassification out of AOCI        
Total net realized and unrealized (losses) gains 0 38 0 38
Income before federal income tax 0 38 0 38
Total federal income tax expense 0 (13) 0 (13)
Net income 0 25 0 25
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Total net realized and unrealized (losses) gains (11) (11) (5) (41)
Net investment income (19) (65) (33) (187)
Income before federal income tax (8) (54) (28) (146)
Total federal income tax expense 2 19 6 51
Net income (6) (35) (22) (95)
Available-for-sale Securities [Member] | Reclassification out of AOCI        
Total net realized and unrealized (losses) gains (10,839) 6,760 (18,258) 7,135
Income before federal income tax 10,839 (6,760) 18,258 (7,135)
Total federal income tax expense (2,276) 2,366 (3,834) 2,497
Net income $ 8,563 $ (4,394) $ 14,424 $ (4,638)