Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Tenant and other receivables, allowance for doubtful accounts (in US dollars)	$ 11,513	$ 10,920
Receivable arising from the straight-lining of rents, allowance (in US dollars)	1,656	2,227
Deferred leasing costs, accumulated amortization (in US dollars)	242,373	228,862
Identified intangible assets, accumulated amortization (in US dollars)	$ 211,285	$ 207,330
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Preferred shares of beneficial interest: par value per share	$ 0	$ 0
Preferred shares of beneficial interest: authorized shares	110,000,000	110,000,000
Preferred shares of beneficial interest: issued shares	42,823,428	42,824,829
Preferred shares of beneficial interest: outstanding shares	42,823,428	42,824,829
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	189,465,023	189,100,876
Common shares of beneficial interest: outstanding shares	189,465,023	189,100,876
Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties	12,477,710	12,197,162
Series D Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS 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 (in US dollars)	$ 11,513	$ 10,920
Receivable arising from the straight-lining of rents, allowance (in US dollars)	1,656	2,227
Deferred leasing costs, accumulated amortization (in US dollars)	242,373	228,862
Identified intangible assets, accumulated amortization (in US dollars)	$ 211,285	$ 207,330
Vornado Realty L.P. | Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties	12,477,710	12,197,162
Vornado Realty L.P. | Series D Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties	177,101	177,101