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Schedule IV-Mortgage Loans on Real Estate (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | $ 1,898,888,000 |  |  |
Carrying Amount of Mortgages | 1,421,654,000 | 2,449,554,000 | 4,012,067,000 | 6,662,379,000
Asset specific reserves on impaired loans | 482,300,000 |  |  |
Principal amount of loan in default that is more than 90 days delinquent | 90 days |  |  |
Senior Mortgages [Member] |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 1,746,877,000 |  |  |
Carrying Amount of Mortgages | 1,308,495,000 |  |  |
Borrower A |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 99,725,000 |  |  |
Carrying Amount of Mortgages | 99,730,000 |  |  |
Borrower A | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.30% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower A | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.30% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower B |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 96,997,000 |  |  |
Carrying Amount of Mortgages | 98,055,000 |  |  |
Borrower B | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.50% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower B | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.50% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower C(3) |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 221,358,000 |  |  |
Carrying Amount of Mortgages | 74,541,000 |  |  |
Delinquency period for a loan to be considered as non-performing and on non-accrual status | 221,400,000 |  |  |
Borrower C(3) | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Fixed interest rate (as a percent) | 17.00% |  |  |
Borrower C(3) | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Fixed interest rate (as a percent) | 17.00% |  |  |
Borrower D(4) |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 71,480,000 |  |  |
Carrying Amount of Mortgages | 62,248,000 |  |  |
Borrower D(4) | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.50% |  |  |
Borrower D(4) | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.50% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower D(4) | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.50% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower E(5) |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 59,338,000 |  |  |
Carrying Amount of Mortgages | 59,474,000 |  |  |
Borrower E(5) | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |
Borrower E(5) | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower E(5) | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower F(6) |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 137,807,000 |  |  |
Carrying Amount of Mortgages | 56,087,000 |  |  |
Delinquency period for a loan to be considered as non-performing and on non-accrual status | 137,800,000 |  |  |
Borrower F(6) | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.50% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower F(6) | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Fixed interest rate (as a percent) | 0.00% |  |  |
Borrower G(7) |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 55,830,000 |  |  |
Carrying Amount of Mortgages | 55,816,000 |  |  |
Borrower G(7) | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 4.25% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower G(7) | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 4.25% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower H |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 54,596,000 |  |  |
Carrying Amount of Mortgages | 51,705,000 |  |  |
Borrower H | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.88% |  |  |
Borrower H | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 1.50% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower H | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 1.50% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower I |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 46,910,000 |  |  |
Carrying Amount of Mortgages | 47,666,000 |  |  |
Borrower I | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 7.00% |  |  |
Variable rate basis | LIBOR |  |  |
Borrower I | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 7.00% |  |  |
Variable rate basis | LIBOR |  |  |
Senior mortgages individually 3% |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 902,836,000 |  |  |
Carrying Amount of Mortgages | 703,173,000 |  |  |
Senior mortgages individually 3% | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Fixed interest rate, low end of range (as a percent) | 4.00% |  |  |
Fixed interest rate, high end of range (as a percent) | 23.00% |  |  |
Senior mortgages individually 3% | Contractual Interest Accrual Rates | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 1.50% |  |  |
Variable rate basis | LIBOR |  |  |
Senior mortgages individually 3% | Contractual Interest Accrual Rates | Maximum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 8.25% |  |  |
Variable rate basis | LIBOR |  |  |
Senior mortgages individually 3% | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Fixed interest rate, low end of range (as a percent) | 2.50% |  |  |
Fixed interest rate, high end of range (as a percent) | 10.00% |  |  |
Senior mortgages individually 3% | Contractual Interest Payment Rates | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 0.50% |  |  |
Variable rate basis | LIBOR |  |  |
Senior mortgages individually 3% | Contractual Interest Payment Rates | Maximum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 8.25% |  |  |
Variable rate basis | LIBOR |  |  |
Subordinate Mortgages |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 152,011,000 |  |  |
Carrying Amount of Mortgages | 113,159,000 |  |  |
Subordinate mortgages individually 3% |  |  |  |
Mortgage loans on real estate |  |  |  |
Face Amount of Mortgages | 152,011,000 |  |  |
Carrying Amount of Mortgages | $ 113,159,000 |  |  |
Subordinate mortgages individually 3% | Contractual Interest Accrual Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Fixed interest rate, low end of range (as a percent) | 5.00% |  |  |
Fixed interest rate, high end of range (as a percent) | 14.00% |  |  |
Subordinate mortgages individually 3% | Contractual Interest Accrual Rates | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.98% |  |  |
Variable rate basis | LIBOR |  |  |
Subordinate mortgages individually 3% | Contractual Interest Accrual Rates | Maximum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.98% |  |  |
Variable rate basis | LIBOR |  |  |
Subordinate mortgages individually 3% | Contractual Interest Payment Rates |  |  |  |
Mortgage loans on real estate |  |  |  |
Fixed interest rate, low end of range (as a percent) | 6.50% |  |  |
Fixed interest rate, high end of range (as a percent) | 10.50% |  |  |
Subordinate mortgages individually 3% | Contractual Interest Payment Rates | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.98% |  |  |
Variable rate basis | LIBOR |  |  |
Subordinate mortgages individually 3% | Contractual Interest Payment Rates | Maximum |  |  |  |
Mortgage loans on real estate |  |  |  |
Basis spread on variable rate (as a percent) | 3.98% |  |  |
Variable rate basis | LIBOR |  |  |

X
- Definition Loan Non Performing And Non Accrual Status Delinquency Period + References No definition available. + Details
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- Definition Amount of principal due on loans that have been delinquent more than 90 days. + References No definition available. + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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- Definition The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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- Definition The highest stated interest rate within the mortgage loans included in the loan grouping. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 + Details
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- Definition The lowest stated interest rate within the mortgage loans included in the loan grouping. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 + Details
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- Definition The amount of any write-down or reserve provided in the period on a mortgage loan on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.7) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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