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Noncontrolling interest (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 (amounts in thousands):
Balance as of December 31, 2017
$
13,393

Net income attributable to noncontrolling interest-redeemable
7,285

Noncontrolling interest-redeemable distributions
(7,057
)
Acquired noncontrolling interest-redeemable
8,232

  Noncontrolling interest-redeemable sale
(7,116
)
Balance as of September 30, 2018
$
14,737