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Non-Cash Activities (Notes)	3 Months Ended
Non-Cash Activities (Notes)	Mar. 31, 2012
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 March 31, 2012 and 2011 amounted to $15.7 million and $31.0 million, respectively.

The entire disclosure for exchanges with other entities that involve principally nonmonetary assets or liabilities or relate to a transfer of nonmonetary assets for which the entity receives no assets in return.

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