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Mortgage and Other Notes Receivable (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Mortgage and Other Notes Receivable [Line Items]
Percentage of assignment of the partnership interest		100.00%
Balance	[1]	$ 8,677	$ 8,945
Mortgages
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 5,333	$ 5,418
Mortgages | Columbia Place Outparcel
Mortgage and Other Notes Receivable [Line Items]
Interest Rate		5.00%	5.00%
Balance		$ 297	$ 302
Mortgages | One Park Place
Mortgage and Other Notes Receivable [Line Items]
Interest Rate		5.00%	5.00%
Balance		$ 942	$ 1,010
Mortgages | Village Square
Mortgage and Other Notes Receivable [Line Items]
Interest Rate		4.00%	4.00%
Balance		$ 1,583	$ 1,596
Mortgages | Other
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 2,511	$ 2,510
Mortgages | Other | Minimum
Mortgage and Other Notes Receivable [Line Items]
Interest Rate		4.39%	4.07%
Mortgages | Other | Maximum
Mortgage and Other Notes Receivable [Line Items]
Interest Rate		9.50%	9.50%
Mortgages | The Promenade at Dlberville
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 1,100
Other Notes Receivable
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 3,344	$ 3,527
Other Notes Receivable | ERMC
Mortgage and Other Notes Receivable [Line Items]
Interest Rate		4.00%	4.00%
Balance		$ 2,689	$ 2,855
Other Notes Receivable | Southwest Theaters
Mortgage and Other Notes Receivable [Line Items]
Interest Rate		5.00%	5.00%
Balance		$ 655	$ 672
[1] As of March 31, 2018, includes $644,383 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $350,123 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 6.

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- Definition

Mortgage and Other Notes Receivable [Line Items]

+ References

No definition available.

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- Definition

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

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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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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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