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v3.21.1

Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Mortgages Payable | Fair Value |  |
Financial liabilities: |  |
Financial liabilities | $ 1,614,367 | $ 1,606,470
Mortgages Payable | Carrying Amount |  |
Financial liabilities: |  |
Financial liabilities | 1,601,635 | 1,603,869
Unsecured term loans | Fair Value |  |
Financial liabilities: |  |
Financial liabilities | 400,354 | 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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