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Fair Value Measurements - Financial Instruments Not Measure at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Mortgages Payable | Carrying Value
Debt Instrument [Line Items]
Debt instrument, fair value disclosure	$ 106,932	$ 107,261
Mortgages Payable | Estimated Fair Value
Debt Instrument [Line Items]
Debt instrument, fair value disclosure	105,459	106,494
Unsecured Debt | Term Loan | Carrying Value
Debt Instrument [Line Items]
Line of credit and term loan, estimated fair value	400,000	400,000
Unsecured Debt | Term Loan | Estimated Fair Value
Debt Instrument [Line Items]
Line of credit and term loan, estimated fair value	398,922	400,055
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated | Carrying Value
Debt Instrument [Line Items]
Line of credit and term loan, estimated fair value	0	50,000
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated | Estimated Fair Value
Debt Instrument [Line Items]
Line of credit and term loan, estimated fair value	$ 0	$ 50,032

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

No definition available.

+ Details

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