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Mortgage Loans on Real Estate Schedule of Mortgage Loan Portfolio by Geographic Region and Property Type (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,700,000 | $ 2,800,000
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,762,861 | 2,856,011
Percent of Mortgage Loans | 100.00% | 100.00%
Mortgage Loans Office Property Type [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 702,796 | 777,343
Percent of Mortgage Loans | 25.50% | 27.20%
Mortgage Loans Medical Office Property Type [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 143,971 | 175,580
Percent of Mortgage Loans | 5.20% | 6.10%
Mortgage Loans Retail Property Type [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 699,190 | 635,916
Percent of Mortgage Loans | 25.30% | 22.30%
Mortgage Loans Industrial/Warehouse Property Type [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 699,690 | 710,426
Percent of Mortgage Loans | 25.30% | 24.90%
Mortgage Loans Hotel Property Type [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 106,596 | 139,193
Percent of Mortgage Loans | 3.90% | 4.90%
Mortgage Loans Apartment Property Type [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 208,099 | 187,548
Percent of Mortgage Loans | 7.50% | 6.60%
Mortgage Loans Mixed Use/Other Property Type [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 202,519 | 230,005
Percent of Mortgage Loans | 7.30% | 8.00%
Mortgage Loans East United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 719,407 | 719,231
Percent of Mortgage Loans | 26.00% | 25.20%
Mortgage Loans Middle Atlantic United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 156,828 | 169,240
Percent of Mortgage Loans | 5.70% | 5.90%
Mortgage Loans Mountain United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 404,803 | 411,054
Percent of Mortgage Loans | 14.70% | 14.40%
Mortgage Loans New England United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 26,763 | 36,815
Percent of Mortgage Loans | 1.00% | 1.30%
Mortgage Loans Pacific United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 325,936 | 309,693
Percent of Mortgage Loans | 11.80% | 10.80%
Mortgage Loans South Atlantic United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 500,232 | 493,764
Percent of Mortgage Loans | 18.10% | 17.30%
Mortgage Loans West North Central United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 406,511 | 487,693
Percent of Mortgage Loans | 14.70% | 17.10%
Mortgage Loans West South Central United States Region [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 222,381 | $ 228,521
Percent of Mortgage Loans | 8.00% | 8.00%

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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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