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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net realized and unrealized investment (losses) gains $ (2,183) $ (4,787) $ 15,295 $ (16,988)
Net investment income (55,826) (52,443) (164,949) (141,227)
Loss and loss expense incurred 398,675 379,199 1,166,238 1,130,468
Other insurance expenses 90,234 80,108 261,975 244,342
Income before federal income tax 71,178 67,130 235,097 159,586
Total federal income tax expense (15,028) (11,695) (45,333) (26,407)
Net income 56,150 55,435 189,764 133,179
Reclassification out of AOCI        
Net income 2,752 8,977 1,899 15,662
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 146 112 436 337
Other insurance expenses 519 420 1,557 1,258
Income before federal income tax 665 532 1,993 1,595
Total federal income tax expense (140) (112) (419) (335)
Net income 525 420 1,574 1,260
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains (3) 11 (12) 5
Net investment income 0 (19) (21) (33)
Income before federal income tax (3) (8) (33) (28)
Total federal income tax expense 1 2 7 6
Net income (2) (6) (26) (22)
Available-for-sale Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains 2,821 10,839 444 18,258
Income before federal income tax 2,821 10,839 444 18,258
Total federal income tax expense (592) (2,276) (93) (3,834)
Net income $ 2,229 $ 8,563 $ 351 $ 14,424