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FAIR VALUE MEASUREMENTS (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 196,000	$ 28,517,000	$ 8,249,000	$ 33,464,000
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Change in fair value of contingent consideration	(196,000)	6,658,000	(8,249,000)	7,711,000
Contingent consideration additions	0	0	0	0
Contingent consideration payments	0	0	0	(6,000,000)
Ending balance	$ 0	$ 35,175,000	$ 0	$ 35,175,000
Level 3 | Operating results growth rate | Option pricing model
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration, measurement input	0.298		0.298
Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration	$ 0		$ 0
Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration	$ 23,400,000		$ 23,400,000

X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Amount of purchases, (sales), issuances and (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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