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Investments in Partially Owned Entities (Parentheticals) (Details) (Lexington Realty Trust [Member], USD $)
In Thousands
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2008
Lexington Realty Trust [Member]
    
Gain on Stock Issuance$ 8,308$ 9,760$ 5,998 
Prior Period Non Cash Impairment Charges   $ 107,882