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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details)
 9 Months Ended
Sep. 24, 2024
USD ($)
May 28, 2024
USD ($)
Sep. 30, 2024
USD ($)
Oct. 01, 2030
Oct. 01, 2027
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Aug. 23, 2022
USD ($)
swap
Debt Instrument [Line Items]                
Interest rate spread     0.10%          
Revolving credit facility payable, net     $ 187,296,000     $ 274,715,000    
Number of interest rate swaps | swap               2
Construction loans payable, net     178,558,000     77,305,000    
Long-term debt     1,492,882,000          
Principal amount     1,512,879,000     1,410,000,000    
Debt outstanding with fixed-rate     1,320,000,000     1,130,000,000    
Debt outstanding with variable-rate     188,000,000     276,000,000.0    
Carrying value of properties collateralizing mortgage notes     1,660,000,000     1,520,000,000    
Unamortized deferred debt costs     19,997,000     19,300,000    
Debt issuance costs amortization     $ 11,200,000     10,600,000    
Twinbrook Quarter                
Debt Instrument [Line Items]                
Guarantor Obligations, Liquidation Proceeds, Percentage     100.00%          
Twinbrook Quarter                
Debt Instrument [Line Items]                
Long-term debt     $ 125,100,000          
Hampden House                
Debt Instrument [Line Items]                
Guarantor obligations, maximum exposure     $ 58,500,000          
Guarantor Obligations, Liquidation Proceeds, Percentage     100.00%          
Guarantor obligations, current carrying value     $ 26,600,000          
Revolving Credit Facility                
Debt Instrument [Line Items]                
Interest rate spread     1.40%          
Term Facility                
Debt Instrument [Line Items]                
Interest rate spread     1.35%          
Unsecured Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, remaining borrowing capacity     $ 172,600,000          
Revolving credit facility payable, net     288,000,000.0          
Letter of Credit                
Debt Instrument [Line Items]                
Revolving credit facility payable, net     185,000          
Line of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity     525,000,000.0          
Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity     425,000,000.0          
Line of Credit | Term Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity     $ 100,000,000.0          
Line of credit facility, extension term     1 year          
Line of Credit | Unsecured Revolving Credit Facility                
Debt Instrument [Line Items]                
Revolving credit facility payable, net     $ 188,000,000.0          
Secured Debt | Term Loan                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 100,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2027                
Debt Instrument [Line Items]                
Derivative, notional amount               50,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2027 | Forecast                
Debt Instrument [Line Items]                
Derivative, fixed interest rate (as a percent)         2.96%      
Secured Debt | Term Loan | Agreement Ending October 1, 2030                
Debt Instrument [Line Items]                
Derivative, notional amount               $ 50,000,000.0
Secured Debt | Term Loan | Agreement Ending October 1, 2030 | Forecast                
Debt Instrument [Line Items]                
Derivative, fixed interest rate (as a percent)       2.91%        
Secured Debt | Construction-to-Permanent Loan                
Debt Instrument [Line Items]                
Debt instrument, face amount     55,800,000     $ 133,000,000    
Mortgages | Avenel Business Park, Leesburg Pike Plaza Center, and White Oak Shopping Center                
Debt Instrument [Line Items]                
Long-term debt, term 15 years 13 years 4 months 24 days            
Debt instrument, face amount $ 70,000,000 $ 100,000,000            
Debt instrument, interest rate, stated percentage 6.41% 6.38%            
Debt instrument, periodic payment $ 468,700 $ 686,300            
Amortization period 25 years 23 years 4 months 24 days            
Debt instrument, payment at maturity $ 41,700,000 $ 61,500,000            
Repayments of debt   $ 51,200,000            
Mortgages | Kentlands Place Mortgage                
Debt Instrument [Line Items]                
Long-term debt     26,700,000          
Mortgages | The Waycroft Mortgage                
Debt Instrument [Line Items]                
Long-term debt     146,300,000          
Guarantor obligations, maximum exposure     23,600,000          
Mortgages | Ashbrook Marketplace Mortgage                
Debt Instrument [Line Items]                
Long-term debt     19,800,000          
Mortgages | Thruway Mortgage                
Debt Instrument [Line Items]                
Long-term debt     70,000,000.0          
Guarantor obligations, maximum exposure     17,500,000          
Construction Loans | Construction-to-Permanent Loan                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity             $ 145,000,000  
Construction loans payable, net     $ 122,700,000