Investments in Partially Owned Entities (Parentheticals) (Details) (Lexington Realty Trust [Member], USD $) In Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 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