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Mortgage and Other Notes Receivable - Summary (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Assignment of the partnership interest (as a percent)		100.00%
Mortgage and Other Notes Receivable [Line Items]
Balance	[1]	$ 8,429	$ 8,945
Mortgages
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 5,262	$ 5,418
Mortgages | Columbia Place Outparcel
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		5.00%	5.00%
Balance		$ 293	$ 302
Mortgages | One Park Place
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		5.00%	5.00%
Balance		$ 890	$ 1,010
Mortgages | Village Square
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		4.00%	4.00%
Balance		$ 1,569	$ 1,596
Mortgages | Other
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 2,510	$ 2,510
Mortgages | Other | Minimum
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		4.60%	4.07%
Mortgages | Other | Maximum
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		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		$ 3,167	$ 3,527
Other Notes Receivable | ERMC
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		4.00%	4.00%
Balance		$ 2,523	$ 2,855
Other Notes Receivable | Southwest Theaters LLC
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		5.00%	5.00%
Balance		$ 644	$ 672
[1] As of June 30, 2018, includes $638,301 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $351,039 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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Mortgage and Other Notes Receivable [Line Items]

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No definition available.

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- Definition

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

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- Definition

Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column B))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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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://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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