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Schedule IV - Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 1,010,108
Carrying Amount of Mortgages	934,964	$ 726,426	$ 827,796	$ 1,421,654
Reserves on impaired loans	69,600
Borrower A
Mortgage Loans on Real Estate [Line Items]
Prior Liens	0
Face Amount of Mortgages	179,075
Carrying Amount of Mortgages	$ 178,118
Borrower A | Minimum
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR	0.19%
Borrower B
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	155,383
Carrying Amount of Mortgages	153,947
Borrower C
Mortgage Loans on Real Estate [Line Items]
Prior Liens	0
Face Amount of Mortgages	150,456
Carrying Amount of Mortgages	150,291
Borrower D
Mortgage Loans on Real Estate [Line Items]
Prior Liens	0
Face Amount of Mortgages	118,750
Carrying Amount of Mortgages	$ 118,089
Borrower D | Minimum
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR	0.25%
Borrower E
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	90,000
Carrying Amount of Mortgages	$ 89,917
Borrower E | Minimum
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR	0.18%
Senior Mortgages Individually Less than 3 Percent
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 287,736
Carrying Amount of Mortgages	215,926
Senior Mortgages
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	981,400
Carrying Amount of Mortgages	906,288
Subordinate Mortgages Individually Less than 3 Percent
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	28,708
Carrying Amount of Mortgages	28,676
Subordinate Mortgages
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	28,708
Carrying Amount of Mortgages	$ 28,676

X

- 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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Balance Type:	na
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X

- 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 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: 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

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X

- 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=27047687&loc=d3e5864-122674

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of prior lien on the real estate that secures 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=27047687&loc=d3e5864-122674

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X

- Definition

Amount of reserve for write-down of 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
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-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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