Real Estate - Schedule of Purchase Price Allocations (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Purchase Price Allocation
Land	$ 19,609,000	$ 25,440,000
Buildings and improvements	70,354,000	123,459,000
Accounts receivable, prepaids and other assets	0	5,770,000
Acquisition-related intangible assets	18,752,000	23,061,000
Right-of-use asset - Operating lease	0	234,000
Acquisition-related intangible liabilities	(12,965,000)	(4,569,000)
Lease liability - Operating lease	0	(234,000)
Accounts payable and other liabilities	0	(1,009,000)
Net assets acquired	95,750,000	172,152,000
Consideration
Cash	63,425,000	21,208,000
Conversion of note receivable	0	38,674,000
Conversion of accrued interest	0	1,995,000
Debt assumed	31,802,000	0
Liabilities assumed	523,000	116,000
Existing interest in previously unconsolidated investment	0	109,571,000
Acquisition of noncontrolling interests	0	588,000
Total consideration	$ 95,750,000	$ 172,152,000