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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Amortized cost $ 27,617,287 $ 26,603,985
Fair value 29,384,143 26,671,287
NAIC, Class 1 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 17,311,646 16,394,654
Fair value 18,519,001 16,531,250
NAIC, Class 2 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 9,739,539 9,630,251
Fair value 10,305,239 9,598,399
NAIC, Class 3 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 497,545 502,822
Fair value 493,350 474,165
NAIC, Class 4 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 67,353 74,493
Fair value 65,857 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 1,204 1,765
Fair value $ 696 $ 1,395