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Property, net - Components of property (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Real Estate [Abstract]    
Land $ 1,578,877 $ 1,607,590
Buildings and improvements 6,412,728 6,511,741
Tenant improvements 613,854 622,878
Equipment and furnishings 184,379 177,036
Construction in progress 342,539 289,966
Total 9,132,377 9,209,211
Less accumulated depreciation (1,967,728) (1,851,901)
Property, net $ 7,164,649 $ 7,357,310