Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Deferred leasing costs, accumulated amortization (in US dollars)	$ 196,229	$ 207,529
Identified intangible assets, accumulated amortization (in US dollars)	$ 98,587	$ 172,114
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	36,795,640	36,798,580
Preferred shares of beneficial interest: outstanding shares	36,795,640	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	250,000,000	250,000,000
Common shares of beneficial interest: issued shares	190,985,677	190,535,499
Common shares of beneficial interest: outstanding shares	190,985,677	190,535,499
Vornado Realty L.P.
ASSETS
Deferred leasing costs, accumulated amortization (in US dollars)	$ 196,229	$ 207,529
Identified intangible assets, accumulated amortization (in US dollars)	$ 98,587	$ 172,114
Class A
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	13,298,956	12,544,477
Class A | Vornado Realty L.P.
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Common shares of beneficial interest: outstanding shares	190,985,677
Outstanding Partnership Units held by Third Parties	13,298,956	12,544,477
Series D Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	141,401	177,101
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	177,101