RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Dec. 31, 2016
Broad Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 4,581,000
2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 7,825,000
Asset impairments/net loss on disposals | 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,099,000
Cost of Sales | 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			5,045,000
Selling, General and Administrative Expenses | 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 2,780,000
Energy & Mining | 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,607,000
Coatings Segment | 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	305,000
Corporate | 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 225,000