Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Tenant and other receivables, allowance for doubtful accounts	$ 5,171	$ 5,526
Receivable arising from the straight-lining of rents, allowance	739	954
Deferred leasing costs, accumulated amortization	194,078	191,827
Identified intangible assets, accumulated amortization	$ 157,062	$ 150,837
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Preferred shares of beneficial interest: par value per share (in dollars per share)	$ 0	$ 0
Preferred shares of beneficial interest: authorized shares	110,000,000	110,000,000
Preferred shares of beneficial interest: issued shares	36,799,573	36,799,573
Preferred shares of beneficial interest: outstanding shares	36,799,573	36,799,573
Common shares of beneficial interest: par value per share (in dollars per share)	$ 0.04	$ 0.04
Common shares of beneficial interest: authorized shares	250,000,000	250,000,000
Common shares of beneficial interest: issued shares	190,169,168	189,983,858
Common shares of beneficial interest: outstanding shares	190,169,168	189,983,858
Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	12,653,821	12,528,899
Series D Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	177,101	177,101
Vornado Realty L.P.
ASSETS
Tenant and other receivables, allowance for doubtful accounts	$ 5,171	$ 5,526
Receivable arising from the straight-lining of rents, allowance	739	954
Deferred leasing costs, accumulated amortization	194,078	191,827
Identified intangible assets, accumulated amortization	$ 157,062	$ 150,837
Vornado Realty L.P. | Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	12,653,821	12,528,899
Vornado Realty L.P. | Series D Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	177,101	177,101