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Noncontrolling interest (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 (amounts in thousands):
 
Balance as of December 31, 2014
$
11,517

Net income attributable to noncontrolling interest-redeemable
3,785

Noncontrolling interest-redeemable distributions
(3,321
)
Balance as of June 30, 2015
$
11,981