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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details)
 6 Months Ended
Jul. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Oct. 01, 2030
Oct. 01, 2027
Dec. 31, 2024
USD ($)
Aug. 23, 2022
USD ($)
swap
Debt Instrument [Line Items]            
Principal amount   $ 1,583,536,000     $ 1,600,000,000  
Notes payable, principal balance   1,380,000,000        
Debt outstanding with variable-rate         187,000,000.0  
Carrying value of properties collateralizing mortgage notes   $ 1,600,000,000     1,600,000,000  
Debt outstanding with fixed-rate         1,370,000,000  
Interest rate spread (as percent)   0.10%        
Revolving credit facility payable, net   $ 200,876,000     186,489,000  
Number of interest rate swaps | swap           2
Long-term debt   1,564,679,000        
Unamortized deferred debt costs   18,857,000     20,100,000  
Debt issuance costs amortization   12,600,000     11,200,000  
Subsequent Event            
Debt Instrument [Line Items]            
Debt outstanding with variable-rate $ 201,000,000          
Thruway Mortgage            
Debt Instrument [Line Items]            
Principal amount   69,200,000        
Long-term debt   $ 17,500,000        
Twinbrook Quarter            
Debt Instrument [Line Items]            
Guarantor obligations, liquidation proceeds, percentage (as percent)   100.00%        
Twinbrook Quarter            
Debt Instrument [Line Items]            
Line of credit facility, remaining borrowing capacity   $ 7,400,000        
Long-term debt   137,600,000        
Hampden House            
Debt Instrument [Line Items]            
Line of credit facility, remaining borrowing capacity   $ 32,500,000        
Guarantor obligations, liquidation proceeds, percentage (as percent)   100.00%        
Guarantor obligations, current carrying value   $ 26,600,000        
Guarantor obligations, maximum exposure   $ 100,500,000        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Interest rate spread (as percent)   1.40%        
Term Facility            
Debt Instrument [Line Items]            
Interest rate spread (as percent)   1.35%        
Unsecured Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, remaining borrowing capacity   $ 131,900,000        
Revolving credit facility payable, net   301,000,000.0        
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 | Subsequent Event            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 600,000,000.0          
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   425,000,000.0        
Line of Credit | Revolving Credit Facility | Subsequent Event            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 460,000,000.0          
Interest rate spread (as percent) 1.40%          
Line of Credit | Revolving Credit Facility | Minimum | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate spread (as percent) 1.35%          
Line of Credit | Revolving Credit Facility | Maximum | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate spread (as percent) 1.95%          
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 | Term Facility | Subsequent Event            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 140,000,000.0          
Interest rate spread (as percent) 1.35%          
Line of Credit | Term Facility | Minimum | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate spread (as percent) 1.30%          
Line of Credit | Term Facility | Maximum | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate spread (as percent) 1.90%          
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, 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 | 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%    
Mortgages | Kentlands Place Mortgage            
Debt Instrument [Line Items]            
Long-term debt         $ 26,000,000