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FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Contingent Consideration [Roll Forward]
Contingent consideration, beginning balance	$ 0	$ 278	$ 326	$ 1,298
Settlements of contingent consideration liabilities	0	0	(393)	(908)
Total losses (gains) included in earnings	0	0	0	6
Foreign currency translation	0	13	67	(105)
Contingent consideration, ending balance	0	291	0	291
Unrealized gains (losses) still held	0	0	0	6
Fair value option investments
Equity Method Investments [Roll Forward]
Fair value option investments, beginning balance	0	0	0	1,405
Total gains (losses) included in earnings	0	0	0	(1,405)
Fair value option investments, ending balance	0	0	0	0
Unrealized gains (losses) still held	$ 0	$ 0	$ 0	$ (1,405)

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Contingent Consideration

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Foreign Currency Translation

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of sales 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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