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Mortgages Payable (Details) (USD $)	3 Months Ended
Mortgages Payable (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Notes Payable (in US dallars)	$ 1,032,004,000us-gaap_NotesPayable	$ 1,032,780,000us-gaap_NotesPayable
Rego Park 1 Shopping [Member] \| Mortgages [Member] \| Secured [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage of cash mortgage collateralized	100.00%
Debt Instrument Maturity Date String	2016-03
Interest rate (in percentage)	0.40%
Notes Payable (in US dallars)	78,246,000	78,246,000
Duration of loan extended	1 year
Rego Park 2 Property [Member] \| Mortgages [Member] \| Secured [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2018-11
Interest rate (in percentage)	2.03%
Notes Payable (in US dallars)	265,758,000	266,534,000
Basis spread over LIBOR (in percentage)	1.85%
Lexington Avenue Property [Member] \| Retail Space [Member]
Mortgage Loans on Real Estate [Line Items]
Notes Payable (in US dallars)	320,000,000
Mortgage loan converted to recourse (in US Dollars)	75,000,000
Lexington Avenue Property [Member] \| Mortgages [Member] \| Secured [Member] \| Office Space [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2021-03
Interest rate (in percentage)	1.13%
Notes Payable (in US dallars)	300,000,000	300,000,000
Basis spread over LIBOR (in percentage)	0.95%
Lexington Avenue Property [Member] \| Mortgages [Member] \| Secured [Member] \| Retail Space [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2015-08
Interest rate (in percentage)	4.93%
Notes Payable (in US dallars)	320,000,000	320,000,000
Lexington Avenue Property [Member] \| Mortgages [Member] \| Secured [Member] \| Retail Space [Member] \| Maximum [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage loan converted to recourse (in US Dollars)	75,000,000
Paramus Property [Member] \| Mortgages [Member] \| Secured [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2018-10
Interest rate (in percentage)	2.90%
Notes Payable (in US dallars)	$ 68,000,000	$ 68,000,000