FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES - Reconciliation of Beginning and Ending Balances (Details) - Fair Value, Measurements, Recurring - Fair Value, Inputs, Level 3 - Contingent Consideration Liability $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Contingent Liability for Accrued Consideration
Beginning balance at December 31, 2018	$ 4,319
Acquisitions and settlements
Acquisitions	0
Settlements	(1,500)
Total remeasurement adjustments:
Changes in fair value recorded in other (income) expense, net	(114)
Ending Balance at December 31, 2019	2,705
The amount of total (gains) or losses for the year included in earnings or changes to net assets, attributable to changes in unrealized (gains) or losses relating to assets or liabilities still held at year-end.	$ (114)