FAIR VALUE OF FINANCIAL INSTRUMENTS - Level 3 (Details) - Recurring - Level 3 - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 27,057	$ 47,085	$ 35,744	$ 49,131
New acquisitions and revaluations	1,341	3,160	5,314	8,703
Payouts	(6,540)	(16,306)	(19,413)	(24,168)
Interest on outstanding contingencies	178	386	715	1,534
Charge offset, forfeit and other	(514)	(554)	(838)	(1,429)
Ending balance	$ 21,522	$ 33,771	$ 21,522	$ 33,771

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Amount of interest on outstanding contingencies.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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