XML 53 R38.htm IDEA: XBRL DOCUMENT v3.21.1
Investments in Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments in Properties    
Land $ 1,050,305 $ 1,106,392
Acquired ground lease 6,847 10,308
Buildings and improvements 21,024,542 21,335,396
Tenant improvements 680,582 690,892
Total investments in operating properties 22,762,276 23,142,988
Accumulated depreciation and amortization (5,649,019) (5,555,221)
Investments in operating properties, net 17,113,257 17,587,767
Construction in progress and space held for development 2,904,645 2,768,325
Land held for future development 192,896 226,862
Investments in properties, net $ 20,210,798 $ 20,582,954