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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
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Noncontrolling Interests [Abstract]        
Net income (loss) attributable to common shareholders $ 21,763 $ (16,597) $ 110,521 $ (9,311)
Increase (decrease) in equity for conversion of operating partnership units     448 592
Change in common equity and net transfers from noncontrolling interests     $ 110,969 $ (8,719)