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Non-Cash Activities (Notes)	9 Months Ended
Non-Cash Activities (Notes)	Sep. 30, 2011
Non Cash Activities [Abstract]
Nonmonetary Transactions Disclosure [Text Block]	Non-Cash Activities We purchase capital equipment and incur costs relating to construction of facilities, including tenant finishing allowances. Expenditures included in construction trade payables as of September 30, 2011 and 2010 amounted to $19.3 million and $31.1 million, respectively. Non-cash financing activities that occurred during the 2011 period included the assumption of mortgage debt in the amount of $112.6 million, including total premiums of $7.7 million related to the acquisition described in Note 4.