Investments in Properties (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments in Properties
Land	$ 1,064,058	$ 1,061,408
Acquired ground lease	87	6,006
Buildings and improvements	23,998,641	24,287,103
Tenant improvements	824,244	781,540
Total investments in operating properties	25,887,030	26,136,057
Accumulated depreciation and amortization	(7,489,193)	(7,268,981)
Investments in operating properties, net	18,397,837	18,867,076
Construction in progress and space held for development	5,020,464	4,789,134
Land held for future development	179,959	118,452
Investments in properties, net	$ 23,598,260	$ 23,774,662