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Property, net - Components of property (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Real Estate [Abstract]    
Land $ 1,582,191 $ 1,607,590
Buildings and improvements 6,408,362 6,511,741
Tenant improvements 610,084 622,878
Equipment and furnishings 180,735 177,036
Construction in progress 321,142 289,966
Total 9,102,514 9,209,211
Less accumulated depreciation (1,904,231) (1,851,901)
Property, net $ 7,198,283 $ 7,357,310