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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
tenant
store
property
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
tenant
store
property
shares
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Significant Accounting Policies [Line Items]          
Number of tenants | tenant 1   1    
Number of shopping centers | store 31   31    
Allowance for doubtful accounts receivables $ 1,100   $ 1,100   $ 700
Period expected for the sale of property to occur     1 year    
Deferred debt costs, net 9,455   $ 9,455   9,874
Accumulated amortization deferred leasing cost 6,200   6,200   5,900
Deferred leasing costs, net 27,049   27,049   26,928
Accumulated amortization deferred leasing cost 24,100   24,100   21,600
Amortization expense deferred leasing cost     2,700 $ 2,600  
Interest expensed capitalized $ 453 $ 140 $ 793 243  
Commercial development projects, availability for occupancy, maximum period after major construction activity     1 year    
Depreciation and amortization expense     $ 18,500 17,900  
Repairs and maintenance expense     $ 6,400 $ 6,500  
Shares credited to directors' deferred fee accounts | shares     236,861    
Percentage of ownership in Operating Partnership     74.20%    
Held-for-sale          
Significant Accounting Policies [Line Items]          
Number of real estate properties | property 0   0    
Minimum          
Significant Accounting Policies [Line Items]          
Accounts receivable, net representing rental income accrued $ 40,100   $ 40,100   38,700
Allowance for doubtful accounts receivables representing rental income accrued $ 600   $ 600   $ 300
Minimum | Building          
Significant Accounting Policies [Line Items]          
Estimated useful life     35 years    
Maximum | Building          
Significant Accounting Policies [Line Items]          
Estimated useful life     50 years    
Maximum | Building Improvements          
Significant Accounting Policies [Line Items]          
Estimated useful life     20 years    
Giant Food          
Significant Accounting Policies [Line Items]          
Percentage of total revenue     4.50%    
Number of shopping centers | store     9    
Safeway          
Significant Accounting Policies [Line Items]          
Percentage of total revenue     2.60%    
Number of shopping centers | store     8    
Revenues          
Significant Accounting Policies [Line Items]          
Number of tenants | tenant 2   2    
Percentage of total revenue     2.50%