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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Amortized cost $ 27,331,923 $ 26,603,985
Fair value 28,380,393 26,671,287
NAIC, Class 1 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 16,990,834 16,394,654
Fair value 17,755,174 16,531,250
NAIC, Class 2 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 9,755,720 9,630,251
Fair value 10,059,679 9,598,399
NAIC, Class 3 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 519,452 502,822
Fair value 505,434 474,165
NAIC, Class 4 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 64,256 74,493
Fair value 58,988 66,078
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 1,661 1,765
Fair value $ 1,118 $ 1,395