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Property Acquisitions, Discontinued Operations, And Assets Held For Sale Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Pro Forma Consolidated Income Statement Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract]        
Property revenues $ 187,884 $ 174,260 $ 371,315 $ 344,464
Property expenses 71,234 69,623 140,751 137,521
Property results $ 116,650 $ 104,637 $ 230,564 $ 206,943