Organization and Significant Accounting Policies - Components of Revenue Streams, Timing of Satisfying Performance Obligations, and Amounts (Details) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	$ 6,684	$ 6,393
Property management services [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	$ 3,618	3,771
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	$ 1,755	1,715
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	$ 996	851
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	$ 315	$ 56
Timing of satisfaction of performance obligations	Point in time