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Redeemable Noncontrolling Interests (Tables)
 6 Months Ended
Jun. 30, 2017
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest
A reconciliation of redeemable noncontrolling interests is as follows (in thousands):
Balance as of December 31, 2016
$
15,696

Net income attributable to noncontrolling interests
302

Balance as of June 30, 2017
$
15,998