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Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2017
Noncontrolling Interest [Abstract]  
Activity for equity attributable to noncontrolling interests
Activity for the equity attributable to noncontrolling interests for 2017, 2016 and 2015 is as follows:
 
2017

 
 
2016

 
2015

Balance at January 1
$
1,166

 
 
$
1,170

 
$
1,163

Net income
74

 
 
66

 
123

Distributions to noncontrolling interests
(78
)
 
 
(63
)
 
(128
)
Other changes, net
33

 
 
(7
)
 
12

Balance at December 31
$
1,195

 
 
$
1,166

 
$
1,170