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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
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Noncontrolling Interests [Abstract] |  |  |  |
Net income attributable to common shareholders | $ 70,720 | $ 30,703 | $ 206,368 | $ 141,224
Increase (decrease) in equity for conversion of operating partnership units |  |  | 71 | (448)
Decrease in APIC for purchase of remaining noncontrolling ownership interest in consolidated JV |  |  | 0 | (13,285)
Change in common equity and net transfers from non-controlling interests |  |  | $ 206,439 | $ 127,491

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