REAL ESTATE AND OTHER AFFILIATES (Summary of Investments in Real Estate and Other Affiliates) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Investment in Real Estate and Other Affiliates
Carrying Value	$ 106,800		$ 102,287
Share of Earnings/Dividends	9,951	$ 14,386
Cost method investments
Investment in Real Estate and Other Affiliates
Carrying Value	3,856		3,856
Share of Earnings/Dividends	3,625	3,341
Accounts payable and accrued expenses \| The Metropolitan Downtown Columbia
Investment in Real Estate and Other Affiliates
Investment deficit position	$ 4,000		$ 3,800
Operating Assets \| The Metropolitan Downtown Columbia \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	50.00%		50.00%
Carrying Value	$ 0		$ 0
Share of Earnings/Dividends	$ 183	80
Operating Assets \| Stewart Title of Montgomery County, TX \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	50.00%		50.00%
Carrying Value	$ 3,822		$ 3,920
Share of Earnings/Dividends	$ 102	82
Operating Assets \| Woodlands Sarofim 1 \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	20.00%		20.00%
Carrying Value	$ 2,780		$ 2,760
Share of Earnings/Dividends	$ 20	20
Operating Assets \| m.flats/TEN.M \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	50.00%		50.00%
Carrying Value	$ 3,486		$ 4,701
Share of Earnings/Dividends	$ (1,221)	(937)
Master Planned Communities \| The Summit \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	0.00%		0.00%
Carrying Value	$ 78,573		$ 72,171
Share of Earnings/Dividends	$ 7,837	11,128
Seaport District \| Mr. C Seaport \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	35.00%		35.00%
Carrying Value	$ 8,088		$ 8,721
Share of Earnings/Dividends	(632)	0
Strategic Developments \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Carrying Value	102,944		$ 98,431
Share of Earnings/Dividends	$ 6,326	11,045
Strategic Developments \| Circle T Ranch and Power Center \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	50.00%		50.00%
Carrying Value	$ 6,024		$ 5,989
Share of Earnings/Dividends	$ 35	0
Strategic Developments \| HHMK Development \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	50.00%		50.00%
Carrying Value	$ 10		$ 10
Share of Earnings/Dividends	$ 0	0
Strategic Developments \| KR Holdings \| Equity Method Investments
Investment in Real Estate and Other Affiliates
Economic/Legal Ownership	50.00%		50.00%
Carrying Value	$ 161		$ 159
Share of Earnings/Dividends	$ 2	$ 672

Total investment liabilities in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

No definition available.

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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

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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