STOCK OWNERSHIP AND BENEFIT PLANS - Schedule of Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based compensation expense [Line Items]
Stock-based compensation expense, net of income taxes	$ 5,675	$ 5,204	$ 3,580
Earnings per share impact
Basic (in dollars per share)	$ 0.38	$ 0.36	$ 0.25
Diluted (in dollars per share)	$ 0.38	$ 0.36	$ 0.24
Cost of products sold
Stock-based compensation expense [Line Items]
Stock-based compensation	$ 652	$ 620	$ 342
General and administrative expenses
Stock-based compensation expense [Line Items]
Stock-based compensation	4,408	4,052	2,862
Selling and distribution expenses
Stock-based compensation expense [Line Items]
Stock-based compensation	$ 615	$ 532	$ 376