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Real Estate Fund Investments (Narrative) (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) investment	Dec. 31, 2019 USD ($) investment	Jun. 09, 2020 USD ($)
Investment Holdings
Aggregate fair value of Real Estate Fund investments (in US Dollars)	$ 17,453	$ 222,649
Vornado Capital Partners Real Estate Fund
Investment Holdings
Equity method ownership percentage	25.00%
Investment fund period expiration date	2013-07
Investment fund, extension of term	2023-02
Term of the Fund, years	8 years
Investment period for commitments of the Fund, years	3 years
Crowne Plaza Times Square Hotel Joint Venture
Investment Holdings
Default amount			$ 274,355
Debt instrument, interest rate, stated percentage (percent)	3.90%
Real estate fund investments
Investment Holdings
Number of investments held by fund (investment) \| investment	4	4
Aggregate fair value of Real Estate Fund investments (in US Dollars)	$ 17,453	$ 222,649
Fair value below cost	324,111
Unfunded commitments of fund	$ 29,194
Joint Venture \| Crowne Plaza Times Square Hotel Joint Venture
Investment Holdings
Equity method ownership percentage	57.10%
Crowne Plaza Time Square Hotel \| Joint Venture \| Crowne Plaza Times Square Hotel Joint Venture
Investment Holdings
Ownership percentage by noncontrolling owners	24.70%
Vornado Realty Trust \| Real estate fund investments
Investment Holdings
Unfunded commitments of fund	$ 9,266
LIBOR \| Crowne Plaza Times Square Hotel Joint Venture
Investment Holdings
Spread Over LIBOR (percent)	3.69%