Stock-based Compensation (Schedule of AO LTIP Units & Share Based Payment Award Stock Options Valuation Assumptions) (Details) |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Vornado stock options | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Expected volatility | 35.00% | 35.00% | 35.00% |
Expected life (years) | 5 years | 5 years | 5 years |
Risk free interest rate | 2.50% | 2.25% | 1.95% |
Expected dividend yield (percentage) | 2.90% | 2.90% | 3.00% |
Performance Conditioned AO LTIP Units | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Expected volatility | 35.00% | ||
Expected life (years) | 8 years | ||
Risk free interest rate | 2.76% | ||
Expected dividend yield (percentage) | 3.10% | ||
AO LTIP Units | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Expected volatility | 35.00% | 35.00% | |
Expected life (years) | 5 years | 5 years | |
Risk free interest rate | 2.50% | 2.25% | |
Expected dividend yield (percentage) | 2.90% | 2.90% |