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Fair Value Measurements - Financial Instruments Not Measure at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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

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