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Property, net - Components of property (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Land $ 1,635,761 $ 1,894,717
Buildings and improvements 6,527,339 7,752,892
Tenant improvements 578,102 637,355
Equipment and furnishings 164,547 169,841
Construction in progress 298,020 234,851
Total 9,203,769 10,689,656
Less accumulated depreciation (1,760,781) (1,892,744)
Property, net $ 7,442,988 $ 8,796,912