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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Amortized cost $ 26,603,985 $ 22,033,115
Fair value 26,671,287 24,233,657
NAIC, Class 1 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 16,394,654 13,737,381
Fair value 16,531,250 15,250,560
NAIC, Class 2 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 9,630,251 7,838,186
Fair value 9,598,399 8,533,121
NAIC, Class 3 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 502,822 398,294
Fair value 474,165 387,222
NAIC, Class 4 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member]
    
Investment Holdings [Line Items]    
Amortized cost 74,493 53,879
Fair value 66,078 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 1,765 5,375
Fair value $ 1,395 $ 6,603