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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net realized and unrealized gains (losses) $ 13,451 $ (10,549)
Net investment income 50,618 43,231
Loss and loss expense incurred 386,579 384,941
Other insurance expenses 85,079 83,240
Income before federal income tax 73,694 19,931
Total federal income tax expense (12,346) (1,006)
Net income 61,348 18,925
Reclassification out of AOCI    
Net income (333) 4,004
Pension Plan [Member] | Reclassification out of AOCI    
Loss and loss expense incurred 145 112
Other insurance expenses 519 420
Income before federal income tax 664 532
Total federal income tax expense (139) (112)
Net income 525 420
Held-to-maturity Securities [Member] | Reclassification out of AOCI    
Net realized and unrealized gains (losses) 0 1
Net investment income (9) (13)
Income before federal income tax (9) (12)
Total federal income tax expense 2 2
Net income (7) (10)
Available-for-sale Securities [Member] | Reclassification out of AOCI    
Net realized and unrealized gains (losses) (1,077) 4,549
Income before federal income tax (1,077) 4,549
Total federal income tax expense 226 (955)
Net income $ (851) $ 3,594