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Noncontrolling interest (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 (amounts in thousands):
Balance as of December 31, 2016
$
12,567

Net income attributable to noncontrolling interest-redeemable
5,179

Noncontrolling interest-redeemable distributions
(4,242
)
Sale of noncontrolling interest-redeemable
(84
)
Balance as of June 30, 2017
$
13,420