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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, 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