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Noncontrolling interest (Tables)
 3 Months Ended
Mar. 31, 2015
Noncontrolling Interest [Abstract]  
Summary of Activity of Noncontrolling Interest-Redeemable
The following table summarizes the activity of noncontrolling interest-redeemable for the three months ended March 31, 2015 (amounts in thousands):
 
Balance as of December 31, 2014
$
11,517

Net income attributable to noncontrolling interest-redeemable
1,610

Noncontrolling interest-redeemable distributions
(1,830
)
Balance as of March 31, 2015
$
11,297