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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 13,413,102 | $ 11,697,394
Estimated Fair Value | 14,190,456 | 12,110,755
% of Total | 100.00% | 100.00%
Finance |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | 4,592,728 | 3,838,716
Estimated Fair Value | 4,827,880 | 3,983,623
% of Total | 34.00% | 32.90%
Industrial |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | 7,310,121 | 6,607,100
Estimated Fair Value | 7,740,313 | 6,824,063
% of Total | 54.60% | 56.30%
Utility |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | 1,510,253 | 1,240,353
Estimated Fair Value | 1,622,263 | 1,292,305
% of Total | 11.40% | 10.70%
Other |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost |  | 11,225
Estimated Fair Value |  | $ 10,764
% of Total |  | 0.10%

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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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