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Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Noncontrolling Interests [Abstract]                      
Net income (loss) attributable to common shareholders $ 46,850 $ 11,840 $ (16,597) $ 7,286 $ 17,147 $ 1,650 $ 2,134 $ 2,285 $ 49,379 [1] $ 23,216 [1] $ (50,800)
Increase in equity for conversion of operating partnership units                 592 3,528 3,761
Increase in equity from purchase of noncontrolling interests                     647
Change in common equity and net transfers from noncontrolling interests                 $ 49,971 $ 26,744 $ (46,392)
[1] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income (loss) per share amounts may not equal the total computed for the year.