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Leases (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
leases
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
leases
Dec. 31, 2010
Dec. 31, 2009
Operating Leases, Future Minimum Payments Receivable [Abstract]                      
2012 $ 153,304               $ 153,304    
2013 151,302               151,302    
2014 148,684               148,684    
2015 148,384               148,384    
2016 138,570               138,570    
Thereafter 1,367,758               1,367,758    
Additional Rent Based on Percentage of Tenant's sales                 574 665 633
Real Estate Properties [Line Items]                      
Total revenues 64,607 64,737 62,036 62,872 62,250 61,390 59,166 58,544 254,252 241,350 223,529
Lessee [Abstract]                      
Number of Ground Leases 2               2    
Operating Leases, Future Minimum Payments Due [Abstract]                      
2012 802               802    
2013 803               803    
2014 802               802    
2015 803               803    
2016 802               802    
Thereafter 8,203               8,203    
Rent expense                 848 848 848
Minimum Term [Member]
                     
Leases Lease Terms [Line Items]                      
Lease term range as Lessor                 5 years    
Maximum Term [Member]
                     
Leases Lease Terms [Line Items]                      
Lease term range as Lessor                 25 years    
Customer Concentration Risk [Member] | Bloomberg [Member]
                     
Real Estate Properties [Line Items]                      
Total revenues                 $ 84,526 $ 83,137 $ 77,988
Percentage Rent Contributed By Tenant 33.00%       34.00%       33.00% 34.00% 35.00%
Flushing Property [Member]
                     
Lessee [Abstract]                      
Expiration year 2027               2027    
Flushing Property [Member] | Ten Year Extension Option [Member]
                     
Lessee [Abstract]                      
Number Of Extension Options 1               1    
Kings Plaza Regional Shopping Center [Member]
                     
Lessee [Abstract]                      
Expiration year 2018               2018    
Kings Plaza Regional Shopping Center [Member] | Ten Year Extension Option [Member]
                     
Lessee [Abstract]                      
Number Of Extension Options 4               4    
Kings Plaza Regional Shopping Center [Member] | Nine Year Extension Option [Member]
                     
Lessee [Abstract]                      
Number Of Extension Options 1               1