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Mortgage and Other Notes Receivable - Summary (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
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]	$ 7,406	$ 7,672
Mortgages
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 4,807	$ 4,884
Mortgages | Columbia Place Outparcel
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		5.00%	5.00%
Balance		$ 277	$ 283
Mortgages | One Park Place
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		5.00%	5.00%
Balance		$ 728	$ 783
Mortgages | Village Square
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		4.00%	4.00%
Balance		$ 1,290	$ 1,308
Mortgages | Other
Mortgage and Other Notes Receivable [Line Items]
Balance		$ 2,512	$ 2,510
Mortgages | Other | Minimum
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		5.01%	5.01%
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		$ 2,599	$ 2,788
Other Notes Receivable | ERMC
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		4.00%	4.00%
Balance		$ 2,011	$ 2,183
Other Notes Receivable | Southwest Theaters LLC
Mortgage and Other Notes Receivable [Line Items]
Interest Rate (as a percent)		5.00%	5.00%
Balance		$ 588	$ 605
[1] As of March 31, 2019, includes $609,856 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $406,466 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 7.

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Mortgage and Other Notes Receivable [Line Items]

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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.

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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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