Real Estate, Operating Real Estate, Real Estate Under Construction, and Equity Investment in Real Estate - Supplemental Balance Sheet Information Related to ROU Assets and Liabilities (Details) $ in Thousands	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property
Real Estate Properties
Operating ROU assets — land leases	$ 34,496	$ 37,339
Operating Lease, Right-of-Use Asset, Statement of Financial Position	In-place lease and other intangible assets	In-place lease and other intangible assets
Present value of future lease payments/lease obligations	$ 7,287	$ 8,084
Operating Lease, Liability, Current, Statement of Financial Position	Accounts payable, accrued expenses and other liabilities	Accounts payable, accrued expenses and other liabilities
Weighted-average remaining lease term — operating leases (in years)	42 years 6 months	42 years 2 months 12 days
Weighted-average discount rate — operating leases (percent)	6.80%	6.80%
Number of land lease arrangements | lease | property	8	8
Minimum
Real Estate Properties
Lease term range (in years)	4 years	5 years
Maximum
Real Estate Properties
Lease term range (in years)	981 years	982 years