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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Securities Received as Collateral $ 128,000 $ 80,000
Securities for Reverse Repurchase Agreements 413,819 476,531
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 417,550 515,200
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 31,200 28,800
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 377,820 279,186
Securities Loaned, Fair Value of Collateral 121,551 73,625
Securities for Reverse Repurchase Agreements 428,344 499,891
Reported Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 358,875 263,820
Securities Loaned, Fair Value of Collateral $ 117,246 $ 74,389