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Non-controlling Interests
12 Months Ended
Dec. 31, 2017
Non-controlling Interest [Line Items]  
Non-controlling Interests [Text Block]
15. 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 each of the years ended December 31:
 
(in thousands)
2017
 
2016
 
2015
Net income attributable to common shareholders
$
196,422

 
$
819,823

 
$
249,315

Transfers from non-controlling interests:
 
 
 
 
 
Increase in equity for conversion of operating partnership units
117

 
290

 
86

Decrease in additional paid-in-capital for purchase of remaining non-controlling ownership interests in two consolidated joint ventures (1)

 

 
(9,480
)
Change in common equity and net transfers from non-controlling interests
$
196,539

 
$
820,113

 
$
239,921

(1)
See Note 7, "Acquisitions, Dispositions, and Discontinued Operations" for a further discussion of this acquisition of non-controlling ownership interest.