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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Reconciliations of Liabilities Measured and Carried at Fair Value on Recurring Basis, with Significant Unobservable Inputs
The following table summarizes the changes in the balance of the contingent consideration for the three months ended March 31, 2016 (in thousands):
 
Balance as of December 31, 2015
$
(20,981
)
Fair value adjustment
(613
)
Balance as of March 31, 2016
$
(21,594
)