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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details)
 3 Months Ended
Mar. 31, 2025
USD ($)
Oct. 01, 2030
Oct. 01, 2027
Dec. 31, 2024
USD ($)
Aug. 23, 2022
USD ($)
swap
Debt Instrument [Line Items]          
Principal amount $ 1,564,135,000     $ 1,600,000,000  
Notes payable, principal balance 1,370,000,000        
Debt outstanding with variable-rate 196,000,000     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 on LIBOR 0.10%        
Revolving credit facility payable, net $ 195,683,000     186,489,000  
Number of interest rate swaps | swap         2
Long-term debt 1,544,599,000        
Unamortized deferred debt costs 19,536,000     20,100,000  
Debt issuance costs amortization 11,900,000     11,200,000  
Thruway Mortgage          
Debt Instrument [Line Items]          
Principal amount 69,500,000        
Long-term debt $ 17,500,000        
Twinbrook Quarter          
Debt Instrument [Line Items]          
Guarantor Obligations, Liquidation Proceeds, Percentage 100.00%        
Twinbrook Quarter          
Debt Instrument [Line Items]          
Line of credit facility, remaining borrowing capacity $ 14,100,000        
Long-term debt 130,900,000        
Hampden House          
Debt Instrument [Line Items]          
Line of credit facility, remaining borrowing capacity $ 49,100,000        
Guarantor Obligations, Liquidation Proceeds, Percentage 100.00%        
Guarantor obligations, current carrying value $ 26,600,000        
Guarantor obligations, maximum exposure $ 83,900,000        
Revolving Credit Facility          
Debt Instrument [Line Items]          
Interest rate spread on LIBOR 1.40%        
Term Facility          
Debt Instrument [Line Items]          
Interest rate spread on LIBOR 1.35%        
Unsecured Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, remaining borrowing capacity $ 132,400,000        
Revolving credit facility payable, net 296,000,000.0        
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        
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       $ 26,200,000