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Organization and Significant Accounting Policies - Revenues and Tenant and Other Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Other property income | $ 2,261 | $ 2,780 | $ 7,001 | $ 6,956 |
Management, transaction, and other fees | 6,142 | 7,353 | 19,084 | 21,768 |
Tenant and other receivables | 159,137 |  | 159,137 |  | $ 169,337
Management, transaction, and other fee [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Tenant and other receivables | 9,800 |  | 9,800 |  | $ 11,600
Property management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 3,598 | 3,648 | 10,830 | 11,076 |
Asset management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 1,657 | 1,803 | 5,250 | 5,341 |
Leasing services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 708 | 1,239 | 1,948 | 2,702 |
Other transaction fees [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | $ 179 | $ 663 | $ 1,056 | $ 2,649 |

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