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Noncontrolling Interests (LP)	9 Months Ended
Noncontrolling Interests (LP)	Sep. 30, 2011
Noncontrolling Interests [Abstract]
Noncontrolling Interests (LP)	7. Noncontrolling Interests Noncontrolling Interests in Consolidated Affiliates At September 30, 2011, noncontrolling interests in consolidated affiliates relates to our joint venture partner’s 50.0% interest in office properties located in Richmond, VA. Our joint venture partner is an unrelated third party.