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Investments (Mortgage Loans by Maturity Date) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,496,786 | $ 2,312,167
Mortgage Loans On Real Estate Due One Year Through Five Years [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 987,109 | 1,187,387
Mortgage Loans On Real Estate Due After Five Years [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 984,289 | 776,655
Mortgage Loans On Real Estate Due After Ten Years [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 525,388 | $ 348,125

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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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