PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018	Dec. 30, 2018
Property, Plant and Equipment [Abstract]
Depreciation	$ 61,500	$ 60,600
Payments for capital projects	87,941	76,681
Transfer of property, plant and equipment	56,100	43,500
Proceeds from property disposals	539	1,021
Gain (loss) on property disposals	108	$ (80)
Assets held for sale	178		$ 178
Idled assets, carrying amount	43,400
Idled assets, depreciable value	154,400
Idled assets, accumulated depreciation	$ 111,000