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Property, net - Components of property (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Real Estate [Abstract]    
Land $ 1,505,884 $ 1,520,678
Buildings and improvements 6,423,949 6,389,458
Tenant improvements 731,475 726,533
Equipment and furnishings 198,313 230,215
Construction in progress 81,735 126,165
Total 8,941,356 8,993,049
Less accumulated depreciation (2,503,108) (2,349,536)
Property, net $ 6,438,248 $ 6,643,513