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Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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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%

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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