Quarterly report pursuant to Section 13 or 15(d)

Properties, Net (Details)

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Properties, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Investments in real estate    
Less: accumulated depreciation $ (713,283) $ (700,363)
Operating properties, net 2,863,262 2,920,529
Land    
Investments in real estate    
Gross 464,674 463,305
Buildings and improvements    
Investments in real estate    
Gross $ 3,111,871 $ 3,157,587