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Investments (Details 14) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
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Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | $ 2,270,214,000 | $ 1,003,524,000
Pacific [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 613,425,000 | 269,922,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 27.00% | 26.10%
South Atlantic [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 470,722,000 | 233,534,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 20.70% | 24.40%
Mountain [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 198,443,000 | 116,224,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 8.70% | 11.10%
Middle Atlantic [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 311,192,000 | 86,590,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 13.70% | 9.40%
West North Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 155,745,000 | 69,789,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 6.90% | 7.90%
East North Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 221,085,000 | 92,861,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 9.70% | 6.60%
West South Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 147,177,000 | 58,506,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 6.50% | 5.70%
East South Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | 60,121,000 | 40,767,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.70% | 4.70%
New England [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable Commercial Real Estate | $ 92,304,000 | $ 35,331,000
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 4.10% | 4.10%

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- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
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- Definition Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to acquire, develop, construct, improve, or refinance land or a building. Includes [but is not limited to] commercial mortgage loans, which are secured by a [legal] security interest in real property [commercial building or business real property] which thereby serves as collateral securing repayment of the loan; and construction financing, which is an obligation generally in the form of a [promissory] note, used for the funding of construction projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 51, 52, 53 -IssueDate 2006-05-01 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5066-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 7 -Subparagraph a Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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