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Noncontrolling interest (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014 (amounts in thousands):
 
Balance as of December 31, 2013
$
11,258

Net income attributable to noncontrolling interest-redeemable
3,792

Noncontrolling interest-redeemable distributions
(4,182
)
Sale of noncontrolling interest
32

Purchase of noncontrolling interest
101

Balance as of September 30, 2014
$
11,001