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Fair Value Measurements - Financial Instruments Not Measure at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Mortgages payable | Carrying Value
Debt Instrument [Line Items]
Debt instrument, fair value disclosure	$ 106,288	$ 107,261
Mortgages payable | Estimated Fair Value
Debt Instrument [Line Items]
Debt instrument, fair value disclosure	105,217	106,494
Term loans | Term loans | Carrying Value
Debt Instrument [Line Items]
Line of credit and term loan, estimated fair value	400,000	400,000
Term loans | Term loans | Estimated Fair Value
Debt Instrument [Line Items]
Line of credit and term loan, estimated fair value	400,038	400,055
Revolving line of credit | Revolving line of credit | Carrying Value
Debt Instrument [Line Items]
Line of credit and term loan, estimated fair value	0	50,000
Revolving line of credit | Revolving line of credit | 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/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 3: 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=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

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X

- Definition

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+ References

No definition available.

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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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