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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ (1,992) $ 8,187
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 902,000 $ 805,700
Derivative Average Remaining Maturity [1],[3] 5 years 2 months 4 years 11 months
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 1,827 $ 1,498
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 180,000 $ 167,500
Derivative Average Remaining Maturity [1],[3] 4 years 9 months 4 years 7 months
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Swaps Referencing Indices [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 0 $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] 0 0
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] 1,827 1,498
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 180,000 $ 167,500
Derivative Average Remaining Maturity [1],[3] 4 years 9 months 4 years 7 months
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ (3,063) $ 168
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 296,000 $ 217,200
Derivative Average Remaining Maturity [1],[3] 5 years 4 months 4 years 11 months
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 1,373 $ 6,651
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 416,000 $ 416,000
Derivative Average Remaining Maturity [1],[3] 5 years 2 months 5 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ (1,690) $ 6,819
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 712,000 $ 633,200
Derivative Average Remaining Maturity [1],[3] 5 years 4 months 4 years 11 months
Standard & Poor's, BB Rating [Member]    
Credit Derivatives [Line Items]    
Derivative Average Remaining Maturity [1],[2] 4 years 5 months 4 years 6 months
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ (2,129) $ (130)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] 10,000 5,000
Standard & Poor's, BB Rating [Member] | Credit Default Swaps Referencing Indices [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] 0 0
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] 0 0
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] (2,129) (130)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 10,000 $ 5,000
[1] The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
[2] Assumes the value of the referenced credit obligations is zero.
[3] The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.