Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Tenant and other receivables, allowance for doubtful accounts (in US dollars)	$ 4,154	$ 5,526
Receivable arising from the straight-lining of rents, allowance (in US dollars)	1,644	954
Deferred leasing costs, accumulated amortization (in US dollars)	207,529	191,827
Identified intangible assets, accumulated amortization (in US dollars)	$ 172,114	$ 150,837
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Preferred Stock, 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	36,798,580	36,799,573
Preferred shares of beneficial interest: outstanding shares	36,798,580	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	190,535,499	189,983,858
Common shares of beneficial interest: outstanding shares	190,535,499	189,983,858
Vornado Realty L.P.
ASSETS
Tenant and other receivables, allowance for doubtful accounts (in US dollars)	$ 4,154	$ 5,526
Receivable arising from the straight-lining of rents, allowance (in US dollars)	1,644	954
Deferred leasing costs, accumulated amortization (in US dollars)	207,529	191,827
Identified intangible assets, accumulated amortization (in US dollars)	$ 172,114	$ 150,837
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	12,544,477
Class A
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	12,544,477	12,528,899
Class A | Vornado Realty L.P.
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	12,544,477	12,528,899
Common shares of beneficial interest: outstanding shares	190,535,499
Series D Cumulative Redeemable Preferred Unit
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	177,101	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	177,101	177,101