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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Other property income | $ 2,435 | $ 2,194 | $ 4,740 | $ 4,176 |
Management, transaction, and other fees | 6,126 | 7,442 | 12,942 | 14,415 |
Tenant and other receivables | 186,232 |  | 186,232 |  | $ 169,337
Management, transaction, and other fee [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Tenant and other receivables | 9,200 |  | 9,200 |  | $ 11,600
Property management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 3,353 | 3,665 | 7,232 | 7,428 |
Asset management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 1,756 | 1,760 | 3,594 | 3,538 |
Leasing services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | 529 | 705 | 1,239 | 1,463 |
Other transaction fees [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees | $ 488 | $ 1,312 | $ 877 | $ 1,986 |

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