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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Securities Received as Collateral $ 80,000 $ 0
Securities for Reverse Repurchase Agreements 476,531 443,435
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 515,200 481,197
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 0 0
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 279,186 266,297
Securities Loaned, Fair Value of Collateral 73,625 0
Securities for Reverse Repurchase Agreements 499,891 465,889
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 28,832 0
Reported Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 263,820 259,540
Securities Loaned, Fair Value of Collateral $ 74,389 $ 0