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Noncontrolling Interests
3 Months Ended
Mar. 31, 2013
Noncontrolling Interests [Abstract]  
Noncontrolling Interests
13. Non-controlling Interests
The following table summarizes the effect of changes in our ownership interest in subsidiaries on the equity attributable to common shareholders for the three months ended March 31:
 
(in thousands)
2013
 
2012
Net income attributable to common shareholders
$
63,476

 
$
88,758

Transfers from the non-controlling interests:
 
 
 
Increase (decrease) in equity for conversion of operating partnership units
47

 
(448
)
Change in common equity and net transfers from non-controlling interests
$
63,523

 
$
88,310