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Properties, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Investments in real estate    
Less: accumulated depreciation $ (681,476) $ (700,363)
Operating properties, net 2,632,069 2,920,529
Land    
Investments in real estate    
Gross 424,627 463,305
Buildings and improvements    
Investments in real estate    
Gross $ 2,888,918 $ 3,157,587