Organization and Significant Accounting Policies - Components of Revenue Streams, Timing of Satisfying Performance Obligations, and Amounts (Details) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	$ 6,499	$ 7,355	$ 13,183	$ 13,748
Property management services [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	3,310	3,753	$ 6,928	7,524
Timing of satisfaction of performance obligations			Over time
Asset management services [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	1,669	1,719	$ 3,425	3,434
Timing of satisfaction of performance obligations			Over time
Leasing services [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	1,171	1,336	$ 2,167	2,187
Timing of satisfaction of performance obligations			Point in time
Other transaction fees [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	$ 349	$ 547	$ 663	$ 603
Timing of satisfaction of performance obligations			Point in time