Land, Buildings and Improvements, and Assets Held for Sale - Operating Real Estate (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Real Estate Properties
Land, buildings and improvements — operating properties	$ 1,256,171	$ 1,256,249
Less: Accumulated depreciation	(3,067,292)	(3,005,479)
Land, Buildings and Improvements — Operating Leases
Real Estate Properties
Less: Accumulated depreciation	(87,350)	(80,057)
Investments in real estate	1,168,821	1,176,192
Land | Land, Buildings and Improvements — Operating Leases
Real Estate Properties
Land, buildings and improvements — operating properties	148,860	150,084
Buildings and improvements | Land, Buildings and Improvements — Operating Leases
Real Estate Properties
Land, buildings and improvements — operating properties	1,104,556	1,104,635
Real estate under construction
Real Estate Properties
Land, buildings and improvements — operating properties	$ 2,755	$ 1,530