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Noncontrolling Interest (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Noncontrolling Interest [Line Items]    
Redeemable Noncontrolling Interest [Table Text Block]
The following summarizes the activity for noncontrolling interests for the nine months ended September 30, 2018 and the year ended December 31, 2017:
 
Nine Months Ended September 30, 2018
 
Year Ended December 31, 2017
Beginning balance
$
76

 
$
84

Issuance of limited partnership units
1,185

 
—

Distributions to noncontrolling interests
(50
)
 
(11
)
Net (loss) income allocation
(1
)
 
3

Other comprehensive loss
(2
)
 
—

Ending balance
$
1,208

 
$
76
The following summarizes the activity for noncontrolling interests for the years ended December 31, 2017, 2016 and 2015:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Beginning balance
$
84

 
$
98

 
$
139

Distributions to noncontrolling interests
(11
)
 
(11
)
 
(11
)
Net income (loss)
3

 
(3
)
 
(30
)
Ending balance
$
76

 
$
84

 
$
98