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Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Mortgages Payable | Fair Value
Financial liabilities:
Financial liabilities	$ 1,739,548	$ 1,606,470
Mortgages Payable | Carrying Amount
Financial liabilities:
Financial liabilities	1,684,407	1,603,869
Unsecured term loans | Fair Value
Financial liabilities:
Financial liabilities	400,201	399,678
Unsecured term loans | Carrying Amount
Financial liabilities:
Financial liabilities	$ 400,000	$ 400,000

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- 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

- References

No definition available.

+ Details

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- Details

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- Details

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