SIGNIFICANT ACQUISITIONS - Narrative (Details) € in Thousands, $ in Thousands				1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 13, 2019 USD ($)	May 27, 2019 USD ($)	May 27, 2019 EUR (€)	May 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	May 27, 2019 EUR (€)
Business Acquisition [Line Items]
Cash paid for acquisition, net of payments made to former shareholders							$ 0	$ 94,690
Goodwill					$ 526,257		526,257		$ 523,998
General and Administrative Expense
Business Acquisition [Line Items]
Transaction and integration related costs					61	$ 354	1,885	1,451
Zumbro River Brand, Inc.
Business Acquisition [Line Items]
Payment made on acquisition date	$ 51,842
Amount paid to former shareholders	46,497
Debt paid on purchase date	5,345
Cash acquired from acquisition	686
Cash paid for acquisition, net of payments made to former shareholders	45,811
Working capital adjustments				$ 561
Goodwill	18,505
Zumbro River Brand, Inc. | Human Nutrition & Health
Business Acquisition [Line Items]
Goodwill, amount deductible for tax purposes	$ 4,723
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
Chemogas
Business Acquisition [Line Items]
Payment made on acquisition date		$ 111,324	€ 99,503
Amount paid to former shareholders		99,102	88,579
Debt paid on purchase date		12,222								€ 10,924
Cash acquired from acquisition		4,412								€ 3,943
Cash paid for acquisition, net of payments made to former shareholders		94,690	€ 84,636
Goodwill		$ 59,319
Percentage of outstanding common shares acquired		100.00%								100.00%
Chemogas | Customer relationships
Business Acquisition [Line Items]
Useful life of intangible assets acquired		20 years	20 years
Chemogas | Trade name
Business Acquisition [Line Items]
Useful life of intangible assets acquired		2 years	2 years
Chemogas | Developed technology
Business Acquisition [Line Items]
Useful life of intangible assets acquired		10 years	10 years
Chemogas and Zumbro River Brand, Inc.
Business Acquisition [Line Items]
Transaction and integration related costs					$ 51	$ 316	$ 1,395	$ 1,178