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Noncontrolling interests (Tables)
 6 Months Ended
Jun. 30, 2019
Noncontrolling Interest [Abstract]  
Summary of Activity of Noncontrolling Interest-Redeemable
The following table summarizes the activity of noncontrolling interest-redeemable for the six months ended June 30, 2019 (amounts in thousands):
Balance as of December 31, 2018
$
14,596

Net income attributable to noncontrolling interest-redeemable
5,900

Noncontrolling interest-redeemable distributions
(5,029
)
Balance as of June 30, 2019
$
15,467