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FAIR VALUE MEASUREMENTS - Acquisition-related Contingent Consideration (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in the fair value of contingent consideration $ 4,286 $ 3,353 $ 2,363 $ 6,522
Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance     70,900  
Changes in the fair value of contingent consideration     2,363  
Contractual payments     (2,125)  
Contractual payments included in accrued liabilities at June 30, 2020     (2,424)  
Foreign currency impact     (114)  
Ending balance $ 68,600   $ 68,600