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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2016
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 2016 (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
June 30, 2016
 
June 30, 2016
Balance at beginning of period
$
(21,594
)
 
$
(20,981
)
Payments on contingent consideration
15,751

 
15,751

Fair value adjustment

 
(613
)
Balance at end of period
$
(5,843
)
 
$
(5,843
)