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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Fair Value of Collateral $ 121,958 $ 73,625
Securities Received as Collateral 120,000 80,000
Securities for Reverse Repurchase Agreements 491,824 476,531
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 522,354 515,200
Reported Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 360,475 263,820
Securities Loaned, Fair Value of Collateral 117,219 74,389
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 379,101 279,186
Securities for Reverse Repurchase Agreements $ 512,613 $ 499,891