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Investments (Unrealized Gains on Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net unrealized gains $ 64,804 $ 69,224 $ 123,683
Deferred income tax expense (22,681) (24,228) (43,289)
Net unrealized gains, net of deferred income tax 42,123 44,996 80,394
(Decrease) increase in net unrealized gains in OCI, net of deferred income tax (2,873) (35,398) 28,890
AFS Fixed Income Securities [Member]      
Net unrealized gains 38,781 55,689 90,336
Equity Securities [Member]      
Net unrealized gains 25,864 13,235 32,389
Available-for-sale Securities [Member]      
Net unrealized gains 64,645 68,924 122,725
Total HTM Securities [Member]      
Net unrealized gains $ 159 $ 300 $ 958