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MORTGAGE AND OTHER INDEBTEDNESS, NET (Fixed Rate Loans Repaid) (Details) - USD ($) $ in Thousands	1 Months Ended											3 Months Ended	12 Months Ended
	Sep. 30, 2017	Aug. 31, 2017	Jun. 30, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Oct. 31, 2016	Aug. 31, 2016	Jun. 30, 2016	Apr. 30, 2016	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 31, 2016
Debt Instrument [Line Items]
Principal Balance Repaid													$ 427,247	$ 291,607
Gain (loss) on extinguishment of debt													30,927		$ 256
Mortgage and other indebtedness, net													4,230,845	$ 4,465,294
The Plaza at Fayette, Lexington, KY
Debt Instrument [Line Items]
Interest rate							5.67%
Principal Balance Repaid							$ 37,146
The Shoppes at St. Clair Square, Fairview Heights, IL
Debt Instrument [Line Items]
Interest rate							5.67%
Principal Balance Repaid							$ 18,827
Hamilton Corner, Chattanooga, TN
Debt Instrument [Line Items]
Interest rate						5.67%
Principal Balance Repaid						$ 14,227
Layton Hills Mall, Layton, UT
Debt Instrument [Line Items]
Interest rate					5.66%
Principal Balance Repaid					$ 89,526
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK
Debt Instrument [Line Items]
Interest rate				5.73%
Principal Balance Repaid				$ 53,386
Gain (loss) on extinguishment of debt				$ (8,500)
Outlet Shoppes at Oklahoma City - Phase II
Debt Instrument [Line Items]
Interest rate				3.53%
Principal Balance Repaid				$ 5,545
Outlet Shoppes at Oklahoma City - Phase III
Debt Instrument [Line Items]
Interest rate				3.53%
Principal Balance Repaid				$ 2,704
Hanes Mall, Winston-Salem, NC
Debt Instrument [Line Items]
Interest rate	6.99%
Principal Balance Repaid	$ 144,325
Gain (loss) on extinguishment of debt	$ (371)
The Outlet Shoppes At El Paso
Debt Instrument [Line Items]
Interest rate	7.06%
Principal Balance Repaid	$ 61,561
Cool Springs Crossing
Debt Instrument [Line Items]
Interest rate											4.54%
Principal Balance Repaid											$ 11,313
Gunbarrel Pointe
Debt Instrument [Line Items]
Interest rate											4.64%
Principal Balance Repaid											$ 10,083
Stroud Mall
Debt Instrument [Line Items]
Interest rate											4.59%
Principal Balance Repaid											$ 30,276
York Galleria
Debt Instrument [Line Items]
Interest rate											4.55%
Principal Balance Repaid											$ 48,337
Hamilton Place
Debt Instrument [Line Items]
Interest rate										5.86%
Principal Balance Repaid										$ 98,181
Loan amount										$ 107,000
Stated Interest Rate										4.36%
Dakota Square Mall
Debt Instrument [Line Items]
Interest rate									6.23%
Principal Balance Repaid									$ 55,103
Southaven Towne Center
Debt Instrument [Line Items]
Interest rate								5.50%
Principal Balance Repaid								$ 38,314
Fashion Square | Mortgages
Debt Instrument [Line Items]
Mortgage and other indebtedness, net																$ 38,150
Stated Interest Rate																4.95%
Midland Mall | Mortgages
Debt Instrument [Line Items]
Interest rate							6.10%
Gain (loss) on extinguishment of debt							$ 3,760
Balance of Non-recourse Debt							$ 31,953
Chesterfield Mall
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt												$ 20,420
Chesterfield Mall | Mortgages
Debt Instrument [Line Items]
Interest rate			5.74%									5.74%
Gain (loss) on extinguishment of debt			$ 29,187
Balance of Non-recourse Debt			$ 140,000									$ 140,000
Wausau Center | Mortgages
Debt Instrument [Line Items]
Interest rate		5.85%
Gain (loss) on extinguishment of debt		$ 6,851
Balance of Non-recourse Debt		$ 17,689
Chesterfield Mall, Midland Mall, and Wausau Center
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt													39,798
Balance of Non-recourse Debt													189,642
Chesterfield Mall, Midland Mall, and Wausau Center | Mortgages
Debt Instrument [Line Items]
Mortgage and other indebtedness, net													$ 122,435

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