Stock-based Compensation (Performance Conditioned AO LTIP Units & Vornado Stock Options Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds received from exercise of employee share options and other	$ 899	$ 5,862	$ 6,903
Vornado stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	4 years
Stock options expiration term	10 years
Grants in period, weighted average grant date fair value (usd per share)		$ 12.28	$ 16.64
Proceeds received from exercise of employee share options and other	$ 22	$ 3,516	$ 5,495
Exercises in period, intrinsic value	$ 5,500	859	$ 18,954
Performance Conditioned AO LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average grant date fair value (usd per share)			$ 64.48
Threshold percentage to satisfy performance based condition	110.00%
Threshold period to satisfy performance based condition	20 days
Grant-date fair value			$ 8,983
AO LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration term	10 years
Grant-date fair value		$ 4,319	$ 3,429
Threshold level, percent	100.00%
Special allocation	10.00%
Special distribution, percent	10.00%

Amount of cash inflow from exercise of option under share-based payment arrangement.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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