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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Total net realized losses $ (1,045) $ (2,704)
Net investment income 37,419 30,769
Losses and loss expenses incurred 317,472 297,144
Policy acquisition costs 196,228 183,227
Income before federal income tax 67,574 51,875
Total federal income tax expense (17,134) (14,843)
Net income 50,440 37,032
Reclassification out of AOCI    
Net income 1,279 2,693
Pension Plan [Member] | Reclassification out of AOCI    
Losses and loss expenses incurred 110 329
Policy acquisition costs 397 1,187
Income before federal income tax 507 1,516
Total federal income tax expense (177) (530)
Net income 330 986
Held-to-maturity Securities [Member] | Reclassification out of AOCI    
Total net realized losses 13 28
Net investment income (62) (100)
Income before federal income tax (49) (72)
Total federal income tax expense 17 25
Net income (32) (47)
Available-for-sale Securities [Member] | Reclassification out of AOCI    
Total net realized losses 1,510 2,699
Income before federal income tax 1,510 2,699
Total federal income tax expense (529) (945)
Net income $ 981 $ 1,754