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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
Change in Total Real Estate Assets      
Balance, Beginning of Year $ 3,140,649 $ 3,351,626 $ 3,406,729
Acquisition of Real Estate Assets 22,953 17,595 208
Construction Costs and Improvements 72,822 49,881 54,650
Disposition of Real Estate Assets (91,312) (50,929) (73,015)
Impairment of Real Estate 2,661 (194,552) (6,934)
Write-off of Fully Depreciated Assets (32,723) (32,972) (30,012)
Balance, End of Year $ 3,115,050 $ 3,140,649 $ 3,351,626