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FAIR VALUE MEASUREMENT (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017 are as follows (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Contingent consideration, beginning of period
$
38,837

 
$
57,349

 
$
23,100

Transfers into Level 3
—

 
—

 
—

Transfers out of Level 3
—

 
—

 
—

Total net losses included in earnings (realized and unrealized)
28,402

 
10,788

 
23,931

Purchases, sales and settlements:
 
 
 
 
 
Additions
—

 
19,700

 
11,318

Payments
(33,775
)
 
(49,000
)
 
(1,000
)
Contingent consideration, end of period
$
33,464

 
$
38,837

 
$
57,349