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Investments (Mortgage Loans by Real Estate Geographic Location) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,496,786 | $ 2,312,167
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Pacific [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 671,822 | 593,589
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 26.90% | 25.70%
South Atlantic [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 543,658 | 477,068
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 21.80% | 20.50%
Mountain [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 334,446 | 233,174
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 13.40% | 10.10%
Middle Atlantic [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 266,802 | 300,475
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 10.70% | 13.00%
West North Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 138,442 | 168,063
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 5.50% | 7.30%
East North Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 236,766 | 224,122
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 9.50% | 9.70%
West South Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 168,246 | 161,451
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 6.70% | 7.00%
East South Central [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 59,625 | 62,789
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.40% | 2.70%
New England [Member] |  |
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 76,979 | $ 91,436
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 3.10% | 4.00%

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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 Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: 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=28368275&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: 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 4: 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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