SIGNIFICANT ACQUISITIONS - Narrative (Details) € in Thousands, $ in Thousands				1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 13, 2019 USD ($)	May 27, 2019 USD ($)	May 27, 2019 EUR (€)	May 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 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					$ 522,929		522,929		$ 523,998
General and Administrative Expense
Business Acquisition [Line Items]
Transaction and integration related costs					727	$ 612	1,824	1,097
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
Working capital adjustments				$ 561
Cash paid for acquisition, net of payments made to former shareholders	45,811
Goodwill	18,156
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					$ 276	$ 556	$ 1,344	$ 862