Annual report pursuant to Section 13 and 15(d)

Properties, net (Details)

v2.4.0.6
Properties, net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Properties        
Gross $ 4,038,932 $ 3,948,487 $ 3,452,512 $ 3,121,576
Operating properties, net 2,714,056 2,802,773    
Operating properties, net
       
Properties        
Less: accumulated depreciation (559,679) (503,032)    
Operating properties, net | Land
       
Properties        
Gross 472,483 501,210    
Operating properties, net | Buildings and improvements
       
Properties        
Gross $ 2,801,252 $ 2,804,595