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Investments (Mortgage Loans by Credit Quality Indicator) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Credit Quality Indicators [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,496,786 | $ 2,312,167
High Investment Grade [Member] |  |
Credit Quality Indicators [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,437,244 | 1,235,605
Investment Grade [Member] |  |
Credit Quality Indicators [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 827,993 | 834,494
Average [Member] |  |
Credit Quality Indicators [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 155,914 | 132,607
Watch List [Member] |  |
Credit Quality Indicators [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 49,404 | 76,463
In Or Near Default [Member] |  |
Credit Quality Indicators [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 26,231 | $ 32,998

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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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