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Derivative Instruments (Details 6) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value $ (2,520) [1] $ (3,707) [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 691,700 [1],[2] 696,000 [1],[2]
Derivative Average Remaining Maturity 4 years 9 months 18 days [1],[3] 5 years 2 months 12 days [1],[3]
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value (1,149) [1] (2,077) [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 122,500 [1],[2] 124,500 [1],[2]
Derivative Average Remaining Maturity 5 years 4 months 24 days [1],[3] 5 years 10 months 24 days [1],[3]
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Swaps Referencing Indices [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value 0 [1] 0 [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 0 [1],[2] 0 [1],[2]
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value (1,149) [1] (2,077) [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 122,500 [1],[2] 124,500 [1],[2]
Derivative Average Remaining Maturity 5 years 4 months 24 days [1],[3] 5 years 10 months 24 days [1],[3]
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value (3,821) [1] (2,345) [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 133,200 [1],[2] 135,500 [1],[2]
Derivative Average Remaining Maturity 5 years 7 months 6 days [1],[3] 5 years 6 months [1],[3]
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value 2,551 [1] 937 [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 430,000 [1],[2] 430,000 [1],[2]
Derivative Average Remaining Maturity 4 years 6 months [1],[3] 5 years [1],[3]
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value (1,270) [1] (1,408) [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 563,200 [1],[2] 565,500 [1],[2]
Derivative Average Remaining Maturity 4 years 8 months 12 days [1],[3] 5 years 1 month 6 days [1],[3]
Standard Poors BB Rating [Member] | Single Name Credit Default Swaps [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value (101) [1] (222) [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 6,000 [1],[2] 6,000 [1],[2]
Derivative Average Remaining Maturity 4 years [1],[3] 4 years 6 months [1],[3]
Standard Poors BB Rating [Member] | Credit Default Swaps Referencing Indices [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value 0 [1] 0 [1]
Maximum Potential Future Exposure on Credit Risk Derivatives 0 [1],[2] 0 [1],[2]
Standard Poors BB Rating [Member] | Credit Default Subtotal [Member]
    
Credit Derivatives [Line Items]    
Credit Derivative Current Fair Value (101) [1] (222) [1]
Maximum Potential Future Exposure on Credit Risk Derivatives $ 6,000 [1],[2] $ 6,000 [1],[2]
Derivative Average Remaining Maturity 4 years [1],[3] 4 years 6 months [1],[3]
[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.