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Noncontrolling Interests
6 Months Ended
Jun. 30, 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 six months ended June 30:
 
(in thousands)
2013
 
2012
Net income attributable to common shareholders
$
135,648

 
$
110,521

Transfers from the non-controlling interests:
 
 
 
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