Noncontrolling Interests (Narrative) (Details) (Noncontrolling Interests [Member])	Sep. 30, 2011
Noncontrolling Interests [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Operating Partnership (OP) Units	17,037,553
Long-Term Incentive Plan (LTIP) Units	1,603,205
Outperformance awards in LTIP Units	400,000
Series Two Preferred Units	1,113,044
Convertible Operating Partnership (OP) Units	1,460,688