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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Amortized cost $ 25,859,328 $ 22,033,115
Fair value 26,323,721 24,233,657
NAIC, Class 1 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 15,945,089 13,737,381
Fair value 16,367,238 15,250,560
NAIC, Class 2 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 9,277,558 7,838,186
Fair value 9,352,577 8,533,121
NAIC, Class 3 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 533,890 398,294
Fair value 509,433 387,222
NAIC, Class 4 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 100,907 53,879
Fair value 93,126 56,151
NAIC, Class 5 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 0 0
Fair value 0 0
NAIC, Class 6 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 1,884 5,375
Fair value $ 1,347 $ 6,603