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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Fair Value of Collateral $ 121,064 $ 73,625
Securities Received as Collateral 109,000 80,000
Securities for Reverse Repurchase Agreements 486,700 476,531
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 517,871 515,200
Reported Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 269,280 263,820
Securities Loaned, Fair Value of Collateral 117,217 74,389
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 284,083 279,186
Securities for Reverse Repurchase Agreements $ 509,579 $ 499,891