Quarterly report pursuant to Section 13 or 15(d)

Real Estate Acquisitions And Discontinued Operations (Impact Of Disposal Of Industrial Segment On Revenues And Net Income) (Details)

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Real Estate Acquisitions And Discontinued Operations (Impact Of Disposal Of Industrial Segment On Revenues And Net Income) (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net income $ 60,329 $ 3,565 $ 65,023 $ 18,989
Basic net income per share $ 0.91 $ 0.06 $ 0.98 $ 0.30
Diluted net income per share $ 0.91 $ 0.05 $ 0.98 $ 0.30
Industrial Segment [Member]
       
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Real estate revenues 6,053 7,854 22,503 24,252
Net income $ 3,297 $ 2,778 $ 9,340 $ 8,215
Basic net income per share $ 0.05 $ 0.04 $ 0.14 $ 0.13
Diluted net income per share $ 0.05 $ 0.04 $ 0.14 $ 0.13