Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Deferred leasing costs, accumulated amortization	$ 191,299	$ 207,529
Identified intangible assets, accumulated amortization	$ 99,623	$ 172,114
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Preferred shares of beneficial interest: par value per share (in dollars per share)	$ 0	$ 0
Preferred shares of beneficial interest: authorized shares (shares)	110,000,000	110,000,000
Preferred shares of beneficial interest: issued shares (shares)	36,797,280	36,798,580
Preferred shares of beneficial interest: outstanding shares (shares)	36,797,280	36,798,580
Common shares of beneficial interest: par value per share (in dollars per share)	$ 0.04	$ 0.04
Common shares of beneficial interest: authorized shares (shares)	250,000,000	250,000,000
Common shares of beneficial interest: issued shares (shares)	190,850,321	190,535,499
Common shares of beneficial interest: outstanding shares (shares)	190,850,321	190,535,499
Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	13,346,927	12,544,477
Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	141,401	177,101
Vornado Realty L.P.
ASSETS
Deferred leasing costs, accumulated amortization	$ 191,299	$ 207,529
Identified intangible assets, accumulated amortization	$ 99,623	$ 172,114
Vornado Realty L.P. \| Class A Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	13,346,927	12,544,477
Vornado Realty L.P. \| Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS / PARTNERSHIP UNITS AND EQUITY
Outstanding Partnership Units held by Third Parties (units)	141,401	177,101

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