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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2012
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On July 18, 2012, the Company sold a portfolio of 11 flex/office properties, totaling 466,719 square feet, in Exton, Pennsylvania, for a sales price of $52.7 million. These properties, collectively known as the Oaklands Corporate Center, have been classified as held-for-sale within the Company's consolidated financial statements. Please see Note 10 for further discussion. The Company has evaluated subsequent events through the date the financial statements were issued.