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Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2012
Noncontrolling Interests [Abstract]  
Effect Of Changes In Ownership Interest In Subsidiaries
The following table summarizes the effect of changes in our ownership interest in subsidiaries on the equity attributable to common shareholders for each of the years ended December 31:
 
 
2012
 
2011
 
2010
Net income attributable to common shareholders
$
283,390

 
$
49,379

 
$
23,216

Transfers from the non-controlling interests:
 
 
 
 
 
Increase in equity for conversion of operating partnership units
8,994

 
592

 
3,528

Decrease in additional paid-in-capital for purchase of remaining non-controlling ownership interests in three consolidated joint ventures
(19,549
)
 
—

 
—

Change in common equity and net transfers from non-controlling interests
$
272,835

 
$
49,971

 
$
26,744