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Fair Value Measurements - Financial Instruments Not Measure at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Carrying Value | Mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | $ 107,261 | $ 176,051
Carrying Value | Unsecured Debt | Term Loan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Line of credit and term loan, estimated fair value | 400,000 | 400,000
Carrying Value | Revolving line of credit | Revolving Credit Facility, Amended and Restated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Line of credit and term loan, estimated fair value | 50,000 | 0
Estimated Fair Value | Mortgages |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 106,494 | 178,937
Estimated Fair Value | Unsecured Debt | Term Loan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Line of credit and term loan, estimated fair value | 400,055 | 400,020
Estimated Fair Value | Revolving line of credit | Revolving Credit Facility, Amended and Restated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Line of credit and term loan, estimated fair value | $ 50,032 | $ 0

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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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- 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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- 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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