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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