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Property, net - Components of Property (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Land $ 1,607,590 $ 1,894,717
Buildings and improvements 6,511,741 7,752,892
Tenant improvements 622,878 637,355
Equipment and furnishings 177,036 169,841
Construction in progress 289,966 234,851
Total 9,209,211 10,689,656
Less accumulated depreciation (1,851,901) (1,892,744)
Property, net $ 7,357,310 $ 8,796,912