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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
ft²
tenant
store
property
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Line Items]      
Number of tenants | tenant 1    
Number of shopping centers | store 31    
Allowance for doubtful accounts receivables $ 1,400   $ 1,300
Period expected for the sale of property to occur 1 year    
Area of real estate property (in sq ft) | ft² 197,127    
Property held-for-sale, accumulated depreciation $ 7,000    
Liabilities on property held-for-sale 200    
Deferred debt costs 8,381   8,700
Accumulated amortization, deferred debt costs 6,300   6,200
Deferred leasing costs, net 26,815   26,919
Accumulated amortization deferred leasing cost 27,700   26,600
Amortization expense deferred leasing cost 1,600 $ 1,400  
Interest capitalized $ 920 340  
Commercial development projects, availability for occupancy, maximum period after major construction activity 1 year    
Depreciation expense $ 9,500 9,100  
Repairs and maintenance expense $ 4,300 $ 3,700  
Shares credited to directors' deferred fee accounts | shares 239,553    
Percentage of ownership in Operating Partnership 74.20%    
Other Assets      
Significant Accounting Policies [Line Items]      
Property held-for-sale, book value $ 3,400    
Held-for-sale      
Significant Accounting Policies [Line Items]      
Number of real estate properties | property 1    
Minimum      
Significant Accounting Policies [Line Items]      
Accounts receivable, net representing rental income accrued $ 41,900   41,400
Allowance for doubtful accounts receivables representing rental income accrued $ 400   $ 500
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 4.20%    
Number of shopping centers | store 9    
Capital One      
Significant Accounting Policies [Line Items]      
Percentage of total revenue 2.70%    
Number of shopping centers | store 20    
Albertson's/Safeway      
Significant Accounting Policies [Line Items]      
Percentage of total revenue 2.60%    
Number of shopping centers | store 9    
Revenues      
Significant Accounting Policies [Line Items]      
Number of tenants | tenant 3    
Percentage of total revenue 2.50%