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Noncontrolling interests (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 (amounts in thousands):
Balance as of December 31, 2018
$
14,596

Net income attributable to noncontrolling interest-redeemable
8,955

Noncontrolling interest-redeemable distributions
(7,957
)
Balance as of September 30, 2019
$
15,594