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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Contingent Consideration [Roll Forward]
Contingent consideration, beginning balance	$ 278	$ 1,239	$ 1,298	$ 1,529
Settlements of contingent consideration liabilities	0	0	(908)	(312)
Total losses (gains) included in earnings	0	6	6	33
Foreign currency translation	13	(38)	(105)	(43)
Contingent consideration, ending balance	291	1,207	291	1,207
Unrealized gains (losses) still held	0	6	6	33
Fair Value Option Investments
Equity Method Investments [Roll Forward]
Fair value option investments, beginning balance	0	4,917	1,405	73,902
Total gains (losses) included in earnings	0	14	(1,405)	(68,971)
Fair value option investments, ending balance	0	4,931	0	4,931
Unrealized gains (losses) still held	0	14	(1,405)	(68,971)
Redeemable Preferred Stock
Equity Method Investments [Roll Forward]
Unrealized gains (losses) still held	0	(63)	0	(202)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [Roll Forward]
Available-for-sale securities, redeemable preferred shares, beginning balance	0	10,201	0	10,340
Total gains (losses) included in other comprehensive income (loss)	0	(63)	0	(202)
Available-for-sale securities, redeemable preferred shares, ending balance	$ 0	$ 10,138	$ 0	$ 10,138

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

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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 other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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

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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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