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Summary of Significant Accounting Policies - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for doubtful accounts | $ (3,512) | $ (5,223)
Total | 61,855 | 64,917
Rents currently due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for doubtful accounts | 7,576 | 13,321
Deferred rents |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for doubtful accounts | 5,388 | 8,205
Straight-line rent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for doubtful accounts | 46,429 | 44,863
Other receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for doubtful accounts | $ 5,974 | $ 3,751

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