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Noncontrolling interest (Tables)
 9 Months Ended
Sep. 30, 2016
Noncontrolling Interest [Abstract]  
Summary of Activity of Noncontrolling Interest-Redeemable
The following table summarizes the activity of noncontrolling interest-redeemable for the nine months ended September 30, 2016 (amounts in thousands):
 
Balance as of December 31, 2015
$
12,408

Net income attributable to noncontrolling interest-redeemable
5,992

Noncontrolling interest-redeemable distributions
(5,732
)
Balance as of September 30, 2016
$
12,668