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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Securities Sold under Agreements to Repurchase $ 0 $ 92,446
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0 107,158
Securities for Reverse Repurchase Agreements 443,435 298,466
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 481,197 338,929
Estimate of Fair Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed 266,297 212,946
Securities for Reverse Repurchase Agreements 465,889 314,160
Reported Value Measurement [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Borrowed $ 259,540 $ 201,050