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Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details) - USD ($) | Sep. 30, 2021 | Aug. 31, 2021 | Jun. 11, 2021 | Jan. 05, 2021 | Oct. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 1,147,511,000 |  |  |  |  | $ 1,200,000,000
Debt outstanding with fixed-rate | 949,500,000 |  |  |  |  | 980,800,000
Debt outstanding with variable-rate | 198,000,000 |  |  |  |  | 179,500,000
Carrying value of properties collateralizing mortgage notes | 1,100,000,000 |  |  |  |  | 1,200,000,000
Outstanding line of credit | 95,028,000 |  |  |  |  | 103,913,000
Notes payable | 794,586,000 |  |  |  |  | 827,603,000
Principal amount | 1,135,935,000 |  |  |  |  |
Unamortized deferred debt costs | 11,576,000 |  |  |  |  | 9,300,000
Debt issuance costs amortization | $ 7,200,000 |  |  |  |  | 8,700,000
Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 525,000,000 |  |  |  |
Mortgages | Jamestown Place |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  | $ 6,100,000 |  |
Mortgages | Hunt Club Corners |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  | $ 5,000,000 |  |  |
Revolving Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on LIBOR | 1.40% |  |  |  |  |
Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on LIBOR |  | 1.35% |  |  |  |
Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on LIBOR |  | 1.95% |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 425,000,000 |  |  |  |
Term Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on LIBOR | 1.35% |  |  |  |  |
Term Facility | LIBOR | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on LIBOR |  | 1.30% |  |  |  |
Term Facility | LIBOR | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate spread on LIBOR |  | 1.90% |  |  |  |
Term Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 100,000,000 |  |  |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 228,200,000 |  |  |  |  |
Outstanding line of credit | 98,000,000 |  |  |  |  | $ 104,500,000
Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding line of credit | 185,000 |  |  |  |  |
Park Van Ness Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor obligations, maximum exposure | 3,300,000 |  |  |  |  |
Notes payable | 65,100,000 |  |  |  |  |
Park Van Ness Loan | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  | $ 0 |
Broadlands Village Mortgage |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor obligations, maximum exposure | 3,700,000 |  |  |  |  |
Principal amount | 29,900,000 |  |  |  |  |
Avenel Business Park |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor obligations, maximum exposure | 6,300,000 |  |  |  |  |
Avenel Business Park | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | 24,400,000 |  |  |  |  |
The Waycroft Mortgage |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor obligations, maximum exposure | 23,600,000 |  |  |  |  |
The Waycroft Mortgage | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | 148,500,000 |  |  |  |  |
Ashbrook Marketplace Mortgage | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | 21,500,000 |  |  |  |  |
Kentlands Place Mortgage | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 29,200,000 |  |  |  |  |

X
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