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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2018 and 2017 are as follows (in thousands):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
Contingent consideration, beginning of period
$
15,241

 
$
46,227

 
$
57,349

 
$
23,100

Transfers into Level 3
—

 
—

 
—

 
—

Transfers out of Level 3
—

 
—

 
—

 
—

Total net (gains) losses included in earnings (realized and unrealized)
2,105

 
2,501

 
1,197

 
20,640

Purchases, sales and settlements:
 
 
 
 
 
 
 
Additions
—

 
6,330

 
5,800

 
11,318

Payments
(1,000
)
 
(1,000
)
 
(48,000
)
 
(1,000
)
Contingent consideration, end of period
$
16,346

 
$
54,058

 
$
16,346

 
$
54,058