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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 0	$ 71,800
Impairment		9,549
Assembled workforce
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 41,200
Assembled workforce | Business divesture-related gain (loss)
Finite-Lived Intangible Assets [Line Items]
Impairment		5,200
Assembled workforce | Other income (loss)
Finite-Lived Intangible Assets [Line Items]
Impairment		$ 4,300

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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