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Organization and Significant Accounting Policies - Revenues and Tenant and Other Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | $ 7,355 | $ 6,126 | $ 13,748 | $ 12,942 |
Tenant and other receivables | 131,510 |  | 131,510 |  | $ 143,633
Management, transaction, and other fee [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Tenant and other receivables | 12,000 |  | 12,000 |  | $ 9,900
Property management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 3,753 | 3,353 | 7,524 | 7,232 |
Asset management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 1,719 | 1,756 | 3,434 | 3,594 |
Leasing services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 1,336 | 529 | 2,187 | 1,239 |
Other transaction fees [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | $ 547 | $ 488 | $ 603 | $ 877 |

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