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Investments (Unrealized Gains on Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net unrealized gains $ 69,224 $ 123,683 $ 79,237
Deferred income tax expense (24,228) (43,289) (27,733)
Net unrealized gains, net of deferred income tax 44,996 80,394 51,504
(Decrease) increase in net unrealized gains in OCI, net of deferred income tax (35,398) 28,890 (70,824)
AFS Fixed Income Securities [Member]      
Net unrealized gains 55,689 90,336 39,559
Equity Securities [Member]      
Net unrealized gains 13,235 32,389 37,421
Available-for-sale Securities [Member]      
Net unrealized gains 68,924 122,725 76,980
Total HTM Securities [Member]      
Net unrealized gains $ 300 $ 958 $ 2,257