Quarterly report pursuant to Section 13 or 15(d)

Properties, net (Details)

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Properties, net (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Properties    
Operating properties, net $ 2,629,136 $ 2,714,056
Operating properties, net
   
Properties    
Less: accumulated depreciation (562,345) (559,679)
Operating properties, net | Land
   
Properties    
Gross 443,319 472,483
Operating properties, net | Buildings and improvements
   
Properties    
Gross $ 2,748,162 $ 2,801,252