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Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Noncontrolling Interests [Abstract] |  |  |  |
Net income attributable to common shareholders | $ 72,172 | $ 21,763 | $ 135,648 | $ 110,521
Increase (decrease) in equity for conversion of operating partnership units |  |  | 71 | (448)
Change in common equity and net transfers from non-controlling interests |  |  | $ 135,719 | $ 110,073

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