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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
ft²
tenant
store
property
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
ft²
tenant
store
property
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Line Items]          
Number of tenants | tenant 1   1    
Number of shopping centers | store 29   29    
Percentage of ownership in operating partnership     74.30%    
Allowance for doubtful accounts receivables $ 2,000   $ 2,000   $ 1,300
Period expected for the sale of property to occur     1 year    
Area of real estate property (in sq ft) | ft² 197,127   197,127    
Property held-for-sale, accumulated depreciation $ 7,000   $ 7,000    
Liabilities on property held-for-sale 300   300    
Deferred debt costs 7,703   7,703   8,700
Accumulated amortization, deferred debt costs 6,900   6,900   6,200
Deferred leasing costs, net 26,287   26,287   26,919
Accumulated amortization deferred leasing cost 29,700   29,700   26,600
Amortization expense deferred leasing cost     4,400 $ 4,200  
Interest capitalized 506 $ 600 $ 1,762 1,393  
Commercial development projects, availability for occupancy, maximum period after major construction activity     1 year    
Depreciation expense     $ 29,000 28,200  
Repairs and maintenance expense     $ 9,200 $ 9,000  
Shares credited to directors' deferred fee accounts (in shares) | shares     244,415    
Other Assets          
Significant Accounting Policies [Line Items]          
Property held-for-sale, book value $ 3,600   $ 3,600    
Held-for-sale          
Significant Accounting Policies [Line Items]          
Number of real estate properties | property 1   1    
Minimum          
Significant Accounting Policies [Line Items]          
Accounts receivable, net representing rental income accrued $ 42,500   $ 42,500   41,400
Allowance for doubtful accounts receivables representing rental income accrued $ 500   $ 500   $ 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     4.30%    
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   3    
Percentage of total revenue     2.50%