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Property, net - Components of property (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Real Estate [Abstract]    
Land $ 1,440,383 $ 1,538,270
Buildings and improvements 6,312,458 6,620,708
Tenant improvements 680,047 750,250
Equipment and furnishings 188,960 194,231
Construction in progress 226,246 153,253
Total 8,848,094 9,256,712
Less accumulated depreciation (2,517,703) (2,562,133)
Property, net $ 6,330,391 $ 6,694,579