Land, Buildings and Improvements, and Assets Held for Sale - Operating Real Estate (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Real Estate Properties
Land, buildings and improvements — operating properties	$ 1,222,062	$ 1,095,892
Less: Accumulated depreciation	(3,438,183)	(3,269,057)
Land, Buildings and Improvements — Operating Leases
Real Estate Properties
Less: Accumulated depreciation	(72,781)	(28,295)
Investments in real estate	1,149,281	1,067,597
Land | Land, Buildings and Improvements — Operating Leases
Real Estate Properties
Land, buildings and improvements — operating properties	141,942	122,317
Buildings and improvements | Land, Buildings and Improvements — Operating Leases
Real Estate Properties
Land, buildings and improvements — operating properties	1,080,058	955,009
Real estate under construction
Real Estate Properties
Land, buildings and improvements — operating properties	$ 62	$ 18,566