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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Apr. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration										$ 2,500,000
Impairment loss	$ 0			$ 0	$ (109,486,000)	$ 0
Non-cash impairment charges related to long-lived assets	3,296,000				39,550,000
Restructuring charges related to impairment of right-of-use assets					17,200,000
Other than temporary impairments on equity method investments					6,700,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of contingent consideration	291,000	$ 278,000		$ 1,207,000	291,000	$ 1,207,000	$ 1,298,000	$ 1,239,000	$ 1,529,000
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value option investments	0.0				0.0		1,400,000
Fair value of contingent consideration	300,000				300,000		$ 1,300,000
International
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss	$ 0	$ 0	$ (109,500,000)		$ (109,486,000)

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