REAL ESTATE ACTIVITIES Real Estate Activities (Acquisition) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Business Acquisition [Line Items]
Deferred costs and other assets, net	$ 110,805,000	$ 112,046,000
Present value of additional consideration	0		$ 8,600,000
Vacant anchor space at Moorestown, Valley View and Valley [Member] [Member]
Business Acquisition [Line Items]
Payments to Acquire Real Estate	17,600,000
Vacant anchor space at Moorestown, Valley View and Valley [Member]
Business Acquisition [Line Items]
Payments to Acquire Real Estate	$ 13,900,000