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FAIR VALUE MEASUREMENT (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2018, 2017 and 2016 are as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
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)
10,788

 
23,931

 
—

Purchases, sales and settlements:
 
 
 
 
 
Additions
19,700

 
11,318

 
23,100

Payments
(49,000
)
 
(1,000
)
 
—

Contingent consideration, end of period
$
38,837

 
$
57,349

 
$
23,100