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Property, net - Components of property (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Real Estate [Abstract]    
Land $ 1,462,406 $ 1,538,270
Buildings and improvements 6,332,882 6,620,708
Tenant improvements 733,681 750,250
Equipment and furnishings 190,807 194,231
Construction in progress 253,768 153,253
Total 8,973,544 9,256,712
Less accumulated depreciation (2,540,667) (2,562,133)
Property, net $ 6,432,877 $ 6,694,579