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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 2,820 $ (4,003)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 861,700 $ 893,700
Derivative Average Remaining Maturity [1],[3] 4 years 7 months 4 years 6 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] $ 851 $ 1,689
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 151,500 $ 152,500
Derivative Average Remaining Maturity [1],[3] 4 years 2 months 3 years 11 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] 851 1,689
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 151,500 $ 152,500
Derivative Average Remaining Maturity [1],[3] 4 years 2 months 3 years 11 months
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ (2,451) $ (5,066)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 289,200 $ 315,200
Derivative Average Remaining Maturity [1],[3] 4 years 2 months 4 years 2 months
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 4,554 $ 2,274
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 416,000 $ 416,000
Derivative Average Remaining Maturity [1],[3] 5 years 5 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ 2,103 $ (2,792)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 705,200 $ 731,200
Derivative Average Remaining Maturity [1],[3] 4 years 8 months 4 years 7 months
Standard & Poor's, BB Rating [Member]    
Credit Derivatives [Line Items]    
Derivative Average Remaining Maturity [1],[2] 3 years 2 months 4 years 1 month
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value [1] $ (134) $ (2,900)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] 5,000 10,000
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] (134) (2,900)
Maximum Potential Future Exposure on Credit Risk Derivatives [1],[2] $ 5,000 $ 10,000
[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.