Annual report pursuant to Section 13 and 15(d)

Real Estate Transactions (Details)

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Real Estate Transactions (Details) (55 Corporate Drive [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
sqft
55 Corporate Drive [Member]
 
Real Estate Properties [Line Items]  
Area of office property 204,057
Investment by Company $ 48.1