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Investment in Unconsolidated Joint Ventures Investment in Unconsolidated Joint Ventures - Related Party (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Comcast Innovation and Technology Center [Member] | Equity Method Investee [Member]
   
Comcast Innovative and Technology Center [Abstract]    
developers fee $ 0.7 $ 0.7
Liberty Venture I, LP [Member]
   
Liberty Venture I LP [Abstract]    
Equity Method Investment, Ownership Percentage 25.00% 25.00%
Land, Buildings and Improvements [Member]
   
Liberty Venture I LP [Abstract]    
Number of real estate properties acquired 1 9
Total purchase price 6.8 97.7
Land, Buildings and Improvements [Member] | Liberty Venture I, LP [Member] | General Partner [Member]
   
Liberty Venture I LP [Abstract]    
Number of real estate properties acquired   3
Net rentable area acquired   603,000
Total purchase price   $ 32.2