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Summary of Significant Accounting Policies - Components of Revenue Streams, Timing of Satisfying Performance Obligations, and Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 26,954 | $ 25,851 | $ 40,337
Property management services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 14,075 | 13,470 | 14,415
Timing of satisfaction of performance obligations |  | Over time |  |
Asset management services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 6,542 | 6,752 | 6,921
Timing of satisfaction of performance obligations |  | Over time |  |
Promote income [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees | [1] |  |  | 13,589
Timing of satisfaction of performance obligations |  | Over time |  |
Leasing services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 3,908 | 3,945 | 4,096
Timing of satisfaction of performance obligations |  | Point in time |  |
Other transaction fees [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Management, transaction, and other fees |  | $ 2,429 | $ 1,684 | $ 1,316
Timing of satisfaction of performance obligations |  | Point in time |  |
[1] | The Company recog nized $13.6 million in p romote revenue during the year ended December 31, 2021, for exceeding partnership return hurdles from the Company's performance as managing member in the USAA partnership. The consideration was paid in the form of a real estate asset.

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