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Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Noncontrolling Interests [Abstract] |  |  |  |
Net income attributable to common shareholders | $ 30,703 | $ 11,840 | $ 141,224 | $ 2,529
Increase (decrease) in equity for conversion of operating partnership units |  |  | (448) | 592
Decrease in additional-paid-in-capital for purchase of remaining noncontrolling ownership interest in a consolidated joint venture |  |  | (13,285) | 0
Change in common equity and net transfers from noncontrolling interests |  |  | $ 127,491 | $ 3,121

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