STOCK OWNERSHIP AND BENEFIT PLANS - Schedule of Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock-based compensation expense [Line Items]
Stock-based compensation expense before income taxes	$ 2,975	$ 2,400	$ 3,362
Income tax benefit	0	0	(915)
Stock-based compensation expense, net of income taxes	$ 2,975	$ 2,400	$ 2,447
Earnings per share impact
Basic (in dollars per share)	$ 0.21	$ 0.17	$ 0.18
Diluted (in dollars per share)	$ 0.21	$ 0.17	$ 0.18
Cost of products sold
Stock-based compensation expense [Line Items]
Stock-based compensation expense before income taxes	$ 282	$ 235	$ 243
General and administrative expenses
Stock-based compensation expense [Line Items]
Stock-based compensation expense before income taxes	2,337	1,755	2,240
Selling and distribution expenses
Stock-based compensation expense [Line Items]
Stock-based compensation expense before income taxes	356	336	343
Restructuring expense
Stock-based compensation expense [Line Items]
Stock-based compensation expense before income taxes	$ 0	$ 74	$ 536