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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
General and administrative expense	$ 6,930	$ 6,618	$ 22,720	$ 20,873
Income from acquired leasehold interest	0	0	39,215	0
Income from acquired leasehold interest	369	375	1,199	1,356
Affiliated Entity | Vornado
Related Party Transaction [Line Items]
General and administrative expense	$ 300	400	$ 1,200	1,300
Affiliated Entity | Management Agreement | Vornado | Accounts Receivable
Related Party Transaction [Line Items]
Management fees receivable					$ 300
Affiliated Entity | Management Agreement | Vornado | Interstate
Related Party Transaction [Line Items]
Noncontrolling interest percentage	7.10%		7.10%
Affiliated Entity | Management Agreement | Alexander's, Inc. | Vornado
Related Party Transaction [Line Items]
Noncontrolling interest percentage	32.40%		32.40%
Affiliated Entity | Transition Services | Vornado
Related Party Transaction [Line Items]
General and administrative expense	$ 100	200	$ 500	600
Affiliated Entity | Rent Expense | Vornado
Related Party Transaction [Line Items]
General and administrative expense	$ 200	$ 200	$ 700	$ 700

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