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Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Mortgages payable | Carrying Amount |  |
Financial liabilities: |  |
Financial liabilities | $ 1,127,848 | $ 1,844,652
Mortgages payable | Fair Value |  |
Financial liabilities: |  |
Financial liabilities | 1,162,890 | 1,870,078
Revolving Credit Facility [Member] | Carrying Amount |  |
Financial liabilities: |  |
Financial liabilities | 200,000 | 0
Revolving Credit Facility [Member] | Fair Value |  |
Financial liabilities: |  |
Financial liabilities | 200,177 | 0
Unsecured term loans | Carrying Amount |  |
Financial liabilities: |  |
Financial liabilities | 300,000 | 300,000
Unsecured term loans | Fair Value |  |
Financial liabilities: |  |
Financial liabilities | $ 300,607 | $ 300,727

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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=109250915&loc=d3e13433-108611 + Details
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