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Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Changes in cost of properties      
Beginning balance $ 3,948,487 $ 3,452,512 $ 3,121,576
Acquisitions of operating properties 26,887 187,052 119,249
Building and land improvements 304,079 338,358 211,752
Sales (75,315) (29,430) (65)
Impairments (165,206)    
Other   (5)  
Ending balance 4,038,932 3,948,487 3,452,512
Changes in accumulated depreciation      
Beginning balance 503,032 422,612 343,110
Depreciation expense 99,173 88,048 79,650
Sales (9,640) (7,764)  
Impairments (15,039)    
Other (75) 136 (148)
Ending balance $ 577,601 $ 503,032 $ 422,612