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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of changes in assets and liabilities that are measured at fair value on a recurring basis using significant unobservable inputs
The changes in the fair value of the Company's Level 3 liabilities during the three months ended March 31, 2018 and 2017 are as follows (in thousands):
 
Three Months Ended 
 March 31,
 
2018
 
2017
Contingent consideration, beginning of period
$
57,349

 
$
23,100

Transfers into Level 3
—

 
—

Transfers out of Level 3
—

 
—

Total net (gains) losses included in earnings (realized and unrealized)
(741
)
 
8,746

Purchases, sales and settlements:
 
 
 
Additions
—

 
—

Payments
(23,500
)
 
—

Contingent consideration, end of period
$
33,108

 
$
31,846