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Noncontrolling Interests (Narrative) (Details) (USD $)
In Millions, except Share data
Sep. 30, 2011
Dec. 31, 2010
Noncontrolling Interest [Line Items]  
Common units, units outstanding3,808,7463,928,733
Market value of common units based on closing price$ 110.9 
Liberty Property Limited Partnership [Member]
  
Noncontrolling Interest [Line Items]  
Market value of common units based on closing price$ 110.9