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Schedule III: Real estate and Accumulated depreciation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Lexington Avenue Property [Member]
Dec. 31, 2013
Lexington Avenue Property [Member]
Maximum [Member]
Dec. 31, 2013
Lexington Avenue Property [Member]
Minimum [Member]
Dec. 31, 2013
Rego Park 1 Shopping [Member]
Dec. 31, 2013
Rego Park 1 Shopping [Member]
Maximum [Member]
Dec. 31, 2013
Rego Park 1 Shopping [Member]
Minimum [Member]
Dec. 31, 2013
Rego Park 2 Residential Property [Member]
Dec. 31, 2013
Rego Park 2 Retail Property [Member]
Dec. 31, 2013
Rego Park 2 Retail Property [Member]
Maximum [Member]
Dec. 31, 2013
Rego Park 2 Retail Property [Member]
Minimum [Member]
Dec. 31, 2013
Paramus Property [Member]
Dec. 31, 2013
Flushing Property [Member]
Dec. 31, 2013
Rego Park 3 Property [Member]
Dec. 31, 2013
Rego Park 3 Property [Member]
Maximum [Member]
Dec. 31, 2013
Rego Park 3 Property [Member]
Minimum [Member]
Dec. 31, 2013
Other Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]                                        
Encumbrances $ 1,049,959       $ 634,217     $ 78,246     $ 0 $ 269,496     $ 68,000 $ 0 $ 0     $ 0
Initial cost of Land 21,593       14,432     1,647     0 3,127     1,441 0 779     167
Initial cost of Building, Leaseholds and Leasehold improvements 26,239       12,355     8,953     0 1,467     0 1,660 0     1,804
Costs capitalized subsequent to acquisition 871,744       426,552     48,177     2,265 384,105     10,313 (107) 2,243     (1,804)
Carrying amount of Land 44,971       27,497     1,647     0 3,127     11,754 0 779     167
Carring amount of Building, Leaseholds and Leasehold improvements 869,681       425,842     56,380     0 385,403     0 1,553 503     0
Construction in progress 4,924       0     750     2,265 169     0 0 1,740     0
Total carrying value of property 919,576       453,339     58,777     2,265 388,699     11,754 1,553 3,022     167
Accumulated depreciation and amortization 185,375 160,826 136,460 112,765 116,361     26,056     0 42,145     0 732 81     0
Date of construction         2003     1959       2009       1975        
Date acquired         1992     1992     1992 1992     1992 1992 1992     1992
Property, Plant and Equipment, Useful Life           39 years 9 years   39 years 3 years     40 years 3 years       15 years 5 years  
Differences Between Book and Tax Basis $ 189,757