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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
tenant
Property
store
shares
Jun. 30, 2018
USD ($)
tenant
Property
store
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
tenant
Property
store
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]            
Number of tenants | tenant 1 1   1    
Number of shopping centers | store 32 32   32    
Percentage of ownership in operating partnership       73.90%    
Allowance for doubtful accounts receivables $ 500 $ 500   $ 500   $ 400
Accounts receivable, net representing rental income accrued 43,800 43,800   $ 43,800   44,100
Period expected for the sale of property to occur       1 year    
Deferred debt costs 8,648 8,648   $ 8,648   6,900
Accumulated amortization, deferred debt costs 7,100 7,100   7,100   8,200
Deferred leasing costs, net 27,139 27,139   27,139   27,255
Accumulated amortization deferred leasing cost $ 35,000 35,000   35,000   35,300
Amortization expense deferred leasing cost       2,900 $ 2,800  
Interest capitalized   $ 1,442 $ 825 $ 2,586 1,595  
Commercial development projects, availability for occupancy, maximum period after major construction activity       1 year    
Depreciation expense       $ 19,800 20,200  
Repairs and maintenance expense       $ 5,900 $ 5,300  
Shares credited to directors' deferred fee accounts (in shares) | shares 155,288     4,619    
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | shares       10,735    
Held-for-sale            
Significant Accounting Policies [Line Items]            
Number of real estate properties | Property 0 0   0    
Minimum            
Significant Accounting Policies [Line Items]            
Allowance for doubtful accounts receivables representing rental income accrued $ 200 $ 200   $ 200   $ 200
Minimum | Building            
Significant Accounting Policies [Line Items]            
Estimated useful life (in years)       35 years    
Maximum | Building            
Significant Accounting Policies [Line Items]            
Estimated useful life (in years)       50 years    
Maximum | Building Improvements            
Significant Accounting Policies [Line Items]            
Estimated useful life (in years)       20 years    
Giant Food            
Significant Accounting Policies [Line Items]            
Percentage of total revenue       4.80%    
Number of shopping centers | store       10    
Capital One            
Significant Accounting Policies [Line Items]            
Percentage of total revenue       2.70%    
Number of shopping centers | store       18    
Revenues            
Significant Accounting Policies [Line Items]            
Number of tenants | tenant 2 2   2    
Percentage of total revenue       2.50%    
Glebe Road Construction Loan            
Significant Accounting Policies [Line Items]            
Deferred debt costs $ 1,700 $ 1,700   $ 1,700    
Common Stock            
Significant Accounting Policies [Line Items]            
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | shares       33,149