Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Deferred leasing costs, accumulated amortization (in US dollars)	$ 196,972	$ 196,229
Identified intangible assets, accumulated amortization (in US dollars)	$ 93,113	$ 98,587
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Preferred stock, 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	48,793,402	36,795,640
Preferred shares of beneficial interest: outstanding shares	48,793,402	36,795,640
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	191,354,679	190,985,677
Common shares of beneficial interest: outstanding shares	191,354,679	190,985,677
Vornado Realty L.P.
ASSETS
Deferred leasing costs, accumulated amortization (in US dollars)	$ 196,972	$ 196,229
Identified intangible assets, accumulated amortization (in US dollars)	$ 93,113	$ 98,587
Class A
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	13,583,607	13,298,956
Class A | Vornado Realty L.P.
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	13,583,607	13,298,956
Common shares of beneficial interest: outstanding shares	191,354,679
Series D Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	141,401	141,401
Series D Cumulative Redeemable Preferred Unit | Vornado Realty L.P.
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	141,401	141,401