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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 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 second quarters and first six months of 2019 and 2018 are as follows (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
Contingent consideration, beginning of period
$
49,429

 
$
33,108

 
$
38,837

 
$
57,349

Transfers into Level 3
—

 
—

 
—

 
—

Transfers out of Level 3
—

 
—

 
—

 
—

Total net losses (gains) included in earnings (realized and unrealized)
2,790

 
(167
)
 
17,382

 
(908
)
Purchases, sales and settlements:
 
 
 
 
 
 
 
Additions
—

 
5,800

 
—

 
5,800

Payments
(2,000
)
 
(23,500
)
 
(6,000
)
 
(47,000
)
Contingent consideration, end of period
$
50,219

 
$
15,241

 
$
50,219

 
$
15,241