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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Fair Value of Collateral $ 118,617 $ 121,551
Securities Received as Collateral 128,000 128,000
Securities for Reverse Repurchase Agreements 403,135 413,819
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 404,871 417,550
Reported Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 353,875 358,875
Securities Loaned, Fair Value of Collateral 117,449 117,246
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 370,760 377,820
Securities for Reverse Repurchase Agreements $ 411,988 $ 428,344