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DIVESTITURES AND PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Impact of divestiture on goodwill	$ 11,101					$ 4,685
Impairment		$ 800		$ 817	$ 107,114
Proceeds from the sale of assets and business divestiture			$ 2,700
Gain on sale of property, plant, and equipment			$ 1,700
Parts & Service
Property, Plant and Equipment [Line Items]
Impact of divestiture on goodwill	11,101					$ 0
Extract Technology \| Parts & Service
Property, Plant and Equipment [Line Items]
Impact of divestiture on goodwill	11,100
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Extract Technology
Property, Plant and Equipment [Line Items]
Proceeds from divestiture of businesses	20,800
Gain (loss) on disposition of business	1,900
Net intangible assets written off	$ 1,300