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SUBSEQUENT EVENTS - Narrative (Details) - USD ($)		1 Months Ended	12 Months Ended
	Jan. 01, 2019	Jan. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Mortgage and other notes receivable			$ 7,672,000	$ 8,945,000
Gain (loss) on extinguishment of debt				30,927,000
Mortgage Receivable
Subsequent Event [Line Items]
Mortgage and other notes receivable			4,884,000	5,418,000
Village Square | Mortgage Receivable
Subsequent Event [Line Items]
Mortgage and other notes receivable			1,308,000	$ 1,596,000
Subsequent Event | Acadania Mall
Subsequent Event [Line Items]
Extinguishment of debt		$ 119,760,000
Subsequent Event | Cary Towne Center
Subsequent Event [Line Items]
Extinguishment of debt		43,716,000
Forecast | Acadania Mall
Subsequent Event [Line Items]
Gain (loss) on extinguishment of debt		63,696,000
Forecast | Cary Towne Center
Subsequent Event [Line Items]
Gain (loss) on extinguishment of debt		9,881,000
Unsecured Term Loan
Subsequent Event [Line Items]
Face value of debt instrument			$ 695,000,000
Unsecured Term Loan | Subsequent Event
Subsequent Event [Line Items]
Face value of debt instrument		$ 500,000,000
Secured Debt | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Face value of debt instrument	$ 1,185,000,000
Quarterly installment payments	35,000,000
Secured Debt | Unsecured Term Loan | Subsequent Event
Subsequent Event [Line Items]
Face value of debt instrument	500,000,000
Secured Debt | Revolving Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Face value of debt instrument	$ 685,000,000
Unsecured lines of credit
Subsequent Event [Line Items]
Annual facility fee rate (as a percent)			0.30%
Secured credit facility, borrowing capacity			$ 1,100,000,000
LIBOR | Secured Debt | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)	2.25%
LIBOR | Unsecured lines of credit
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)			1.55%
Minimum | Secured Debt | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Annual facility fee rate (as a percent)		0.25%
Minimum | LIBOR | Unsecured lines of credit
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)			0.875%
Maximum | Secured Debt | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Annual facility fee rate (as a percent)		0.35%
Maximum | LIBOR | Unsecured lines of credit
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)			1.55%

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