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Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT - Repayments (Details) - USD ($) $ in Thousands	1 Months Ended		2 Months Ended	12 Months Ended
	Apr. 30, 2018	Jul. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Principal Balance Repaid				$ 17,278	$ 427,247
Mortgage loan			$ 102,446	$ 0	$ 1,802	$ 0
CoolSprings Galleria
Schedule of Equity Method Investments [Line Items]
Interest rate (as a percent)	6.98%
Principal Balance Repaid	$ 97,732
Mortgage loan	$ 155,000
Gulf Coast Town Center - Phase III
Schedule of Equity Method Investments [Line Items]
Interest rate (as a percent)		3.13%
Principal Balance Repaid		$ 4,118
Ownership interest in joint venture (as a percent)					50.00%