SIGNIFICANT ACQUISITIONS AND DIVESTITURES - Narrative (Details) € in Thousands, $ in Thousands				1 Months Ended	12 Months Ended
	Dec. 13, 2019 USD ($)	May 27, 2019 USD ($)	May 27, 2019 EUR (€)	May 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 27, 2019 EUR (€)
Business Acquisition [Line Items]
Cash paid for acquisitions, net of cash acquired					$ 0	$ 141,062	$ 17,399
Goodwill					529,463	523,998	447,995
General and Administrative Expenses
Business Acquisition [Line Items]
Transaction and integration related costs					2,011	2,273	$ 1,786
HNH
Business Acquisition [Line Items]
Goodwill					$ 424,051	423,600
Zumbro River Brand, Inc.
Business Acquisition [Line Items]
Payment made on acquisition date						52,403
Amount paid to former shareholders						47,058
Debt paid on purchase date	$ 5,345
Cash and cash equivalents	686
Cash paid for acquisitions, net of cash acquired						46,372
Working capital acquired				$ 561
Goodwill	18,505
Translated amount on acquisition date	51,842
Translated amount paid to shareholders	$ 46,497
Zumbro River Brand, Inc. | Customer relationships
Business Acquisition [Line Items]
Useful life of intangible assets acquired	15 years
Zumbro River Brand, Inc. | Trade name
Business Acquisition [Line Items]
Useful life of intangible assets acquired	10 years
Zumbro River Brand, Inc. | Developed technology
Business Acquisition [Line Items]
Useful life of intangible assets acquired	12 years
Zumbro River Brand, Inc. | HNH
Business Acquisition [Line Items]
Expected deductible amount	$ 4,723
Chemogas
Business Acquisition [Line Items]
Payment made on acquisition date | €			€ 99,503
Amount paid to former shareholders | €			88,579
Debt paid on purchase date		$ 12,222						€ 10,924
Cash and cash equivalents		4,412						€ 3,943
Cash paid for acquisitions, net of cash acquired		94,690	€ 84,636
Goodwill		$ 59,319
Percentage of outstanding common shares acquired		100.00%						100.00%
Translated amount on acquisition date		$ 111,324
Translated amount paid to shareholders		$ 99,102
Chemogas | Customer relationships
Business Acquisition [Line Items]
Useful life of intangible assets acquired					20 years
Chemogas | Trade name
Business Acquisition [Line Items]
Useful life of intangible assets acquired					2 years
Chemogas | Developed technology
Business Acquisition [Line Items]
Useful life of intangible assets acquired					10 years
Chemogas And Zumbro River Brand, Inc.
Business Acquisition [Line Items]
Transaction and integration related costs					$ 1,480	$ 1,947