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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2012
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Subsequent to March 31, 2012, the Company completed the sale of 49 properties totaling 2.5 million square feet of leasable space in Wisconsin, Maryland, Virginia, North Carolina and New Jersey for approximately $195 million. The properties consist primarily of single-story and mid-rise office buildings and high-finish flex properties. The properties were 83% leased at the time of the sale. These properties were considered assets held for sale at March 31, 2012 and therefore the results of operations for these properties are included as discontinued operations in the accompanying statements of income.