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Noncontrolling Interests
 12 Months Ended
Dec. 31, 2017
Noncontrolling Interest [Abstract]  
Noncontrolling Interests
Noncontrolling Interests

Noncontrolling Interests in Consolidated Affiliates

At December 31, 2017, our noncontrolling interests in consolidated affiliates relate to our joint venture partner's 50.0% interest in office properties in Richmond. Our joint venture partner is an unrelated third party.

Noncontrolling Interests in the Operating Partnership

Noncontrolling interests in the Operating Partnership relate to the ownership of Redeemable Common Units. Net income attributable to noncontrolling interests in the Operating Partnership is computed by applying the weighted average percentage of Redeemable Common Units during the period, as a percent of the total number of outstanding Common Units, to the Operating Partnership’s net income for the period after deducting distributions on Preferred Units. When a noncontrolling unitholder redeems a Common Unit for a share of Common Stock or cash, the noncontrolling interests in the Operating Partnership are reduced and the Company’s share in the Operating Partnership is increased by the fair value of each security at the time of redemption.

The following table sets forth the Company's noncontrolling interests in the Operating Partnership:

 
Year Ended December 31,
 
2017
 
2016
Beginning noncontrolling interests in the Operating Partnership
$
144,802

 
$
126,429

Adjustment of noncontrolling interests in the Operating Partnership to fair value
(354
)
 
12,993

Conversions of Common Units to Common Stock
(511
)
 
(3,057
)
Net income attributable to noncontrolling interests in the Operating Partnership
5,059

 
15,596

Distributions to noncontrolling interests in the Operating Partnership
(4,987
)
 
(7,159
)
Total noncontrolling interests in the Operating Partnership
$
144,009

 
$
144,802


The following table sets forth net income available for common stockholders and transfers from the Company's noncontrolling interests in the Operating Partnership:

 
Year Ended December 31,
 
2017
 
2016
 
2015
Net income available for common stockholders
$
182,873

 
$
521,789

 
$
94,572

Increase in additional paid in capital from conversions of Common Units to Common Stock
511

 
3,057

 
1,645

Change from net income available for common stockholders and transfers from noncontrolling interests
$
183,384

 
$
524,846

 
$
96,217