Mortgage and Other Notes Receivable (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Mortgage and Other Notes Receivable [Line Items]
Percentage of assignment of the partnership interest	100.00%
Mortgage and other notes receivable	$ 18,347	$ 19,811
Mortgages
Mortgage and Other Notes Receivable [Line Items]
Mortgage and other notes receivable	$ 7,859	$ 9,323
Mortgages \| Columbia Place Outparcel
Mortgage and Other Notes Receivable [Line Items]
Interest Rate, mortgage loans on real estate (as a percent)	5.00%	5.00%
Mortgage and other notes receivable	$ 348	$ 360
Mortgages \| Park Place
Mortgage and Other Notes Receivable [Line Items]
Interest Rate, mortgage loans on real estate (as a percent)	5.00%	5.00%
Mortgage and other notes receivable	$ 1,430	$ 1,566
Mortgages \| Village Square
Mortgage and Other Notes Receivable [Line Items]
Interest Rate, mortgage loans on real estate (as a percent)	3.50%	3.50%
Mortgage and other notes receivable	$ 1,692	$ 1,711
Mortgages \| Other
Mortgage and Other Notes Receivable [Line Items]
Mortgage and other notes receivable	$ 4,389	$ 5,686
Mortgages \| Other \| Minimum
Mortgage and Other Notes Receivable [Line Items]
Interest Rate, mortgage loans on real estate (as a percent)	2.69%	2.67%
Mortgages \| Other \| Maximum
Mortgage and Other Notes Receivable [Line Items]
Interest Rate, mortgage loans on real estate (as a percent)	9.50%	9.50%
Other Notes Receivable
Mortgage and Other Notes Receivable [Line Items]
Mortgage and other notes receivable	$ 10,488	$ 10,488
Other Notes Receivable \| RED Development Inc.
Mortgage and Other Notes Receivable [Line Items]
Mortgage and other notes receivable	$ 7,429	$ 7,429
Interest Rate, other notes receivable (as a percent)	5.00%	5.00%
Other Notes Receivable \| Woodstock land
Mortgage and Other Notes Receivable [Line Items]
Mortgage and other notes receivable	$ 3,059	$ 3,059
Interest Rate, other notes receivable (as a percent)	10.00%	10.00%
Percentage of equity interest in real estate property	75.00%

Mortgage and Other Notes Receivable [Line Items]

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- Definition

Note Receivable, Interest Rate

+ References

No definition available.

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- Definition

Percentage of assignment of the partnership interest in the real estate.

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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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=27047687&loc=d3e5864-122674

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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