XML 132 R35.htm IDEA: XBRL DOCUMENT v2.4.0.8
Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 11,346,144 $ 11,333,431
Estimated Fair Value 11,803,481 12,380,071
% of Total 100.00% 100.00%
Finance
    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost 3,636,121 3,619,455
Estimated Fair Value 3,770,773 3,900,152
% of Total 32.00% 31.50%
Industrial
    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost 5,914,051 5,881,967
Estimated Fair Value 6,138,234 6,443,846
% of Total 52.00% 52.00%
Utility
    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost 1,768,696 1,799,658
Estimated Fair Value 1,867,151 2,002,611
% of Total 15.80% 16.20%
Other
    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost 27,276 32,351
Estimated Fair Value $ 27,323 $ 33,462
% of Total 0.20% 0.30%