Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details) | 3 Months Ended | | | | | |
Mar. 31, 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] | | | | | | |
Revolving credit facility payable, net | $ 272,909,000 | | | $ 274,715,000 | | |
Number of interest rate swaps | swap | | | | | | 2 |
Construction loans payable, net | 108,917,000 | | | 77,305,000 | | |
Long-term debt | 1,408,650,000 | | | | | |
Principal amount | 1,427,291,000 | | | 1,410,000,000 | | |
Debt outstanding with fixed-rate | 1,150,000,000 | | | 1,130,000,000 | | |
Debt outstanding with variable-rate | 274,000,000 | | | 276,000,000 | | |
Carrying value of properties collateralizing mortgage notes | 1,560,000,000 | | | 1,520,000,000 | | |
Unamortized deferred debt costs | 18,641,000 | | | 19,300,000 | | |
Debt issuance costs amortization | 11,300,000 | | | 10,600,000 | | |
Interest rate swaps | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Derivative asset | 4,500,000 | | | | | |
Avenel Business Park | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Guarantor obligations, maximum exposure | $ 6,300,000 | | | | | |
Twinbrook Quarter | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Guarantor Obligations, Liquidation Proceeds, Percentage | 100% | | | | | |
Twinbrook Quarter | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Long-term debt | | | | 92,800,000 | | |
Hampden House | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Guarantor obligations, maximum exposure | | | | 21,400,000 | | |
Guarantor Obligations, Liquidation Proceeds, Percentage | 100% | | | | | |
Guarantor Obligations, Current Carrying Value | $ 26,600,000 | | | | | |
Secured Overnight Financing Rate (SOFR) | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate spread on LIBOR | 0.10% | | | | | |
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Interest rate spread on LIBOR | 1.40% | | | | | |
Term Facility | Secured Overnight Financing Rate (SOFR) | | | | | | |
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 | $ 127,600,000 | | | | | |
Revolving credit facility payable, net | 374,000,000 | | | | | |
Line of Credit | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Line of credit facility, maximum borrowing capacity | 525,000,000 | | | | | |
Line of Credit | Revolving Credit Facility | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Line of credit facility, maximum borrowing capacity | 425,000,000 | | | | | |
Line of Credit | Term Facility | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Line of credit facility, maximum borrowing capacity | $ 100,000,000 | | | | | |
Line of credit facility, extension term | 1 year | | | | | |
Line of Credit | Unsecured Revolving Credit Facility | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Revolving credit facility payable, net | $ 274,000,000 | | | | | |
Secured Debt | Term Loan | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Line of credit facility, maximum borrowing capacity | | | | | | $ 100,000,000 |
Secured Debt | Term Loan | Agreement Ending October 1, 2030 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Derivative, notional amount | | | | | | 50,000,000 |
Secured Debt | Term Loan | Agreement Ending October 1, 2027 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Derivative, notional amount | | | | | | $ 50,000,000 |
Secured Debt | Construction-to-Permanent Loan | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Debt instrument, face amount | 18,600,000 | | | 133,000,000 | | |
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan | Agreement Ending October 1, 2030 | Forecast | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Derivative, fixed interest rate (as a percent) | | 2.91% | | | | |
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan | Agreement Ending October 1, 2027 | Forecast | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Derivative, fixed interest rate (as a percent) | | | 2.96% | | | |
Construction Loans | Construction-to-Permanent Loan | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Line of credit facility, maximum borrowing capacity | | | | | $ 145,000,000 | |
Construction loans payable, net | 90,300,000 | | | | | |
Mortgages | Avenel Business Park | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Long-term debt | 21,300,000 | | | | | |
Mortgages | The Waycroft Mortgage | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Guarantor obligations, maximum exposure | 23,600,000 | | | | | |
Long-term debt | $ 148,100,000 | | | | | |
Mortgages | Ashbrook Marketplace Mortgage | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Long-term debt | | | | 20,100,000 | | |
Mortgages | Kentlands Place Mortgage | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Long-term debt | | | | $ 27,100,000 | | |