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Non-controlling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Non-controlling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 40,893 | $ 290,898 | $ 446,302 | $ 41,730 | $ 60,593 | $ 37,044 | $ 36,079 | $ 115,599 | $ 819,823 | $ 249,315 |  | $ 292,089
Increase in equity for conversion of operating partnership units |  |  |  |  |  |  |  |  | 290 | 86 |  | 52
Decrease in additional paid-in capital for purchase of remaining non-controlling ownership interests in two consolidated joint ventures |  |  |  |  |  |  |  |  | 0 | (9,480) | [1] | 0
Change in common equity and net transfers from non-controlling interests |  |  |  |  |  |  |  |  | $ 820,113 | $ 239,921 |  | $ 292,141
[1] | Refer to Note 7, "Acquisitions, Dispositions, Impairment, and Discontinued Operations," for further discussion of acquisitions.

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