SEGMENT REPORTING (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Oct. 01, 2016 USD ($)
Segment Reporting Information [Line Items]
Net revenue reclassification	$ 564,184	$ 543,903	$ 1,675,280	$ 1,553,064
Number of operating segments | segment			2
Number of reportable segments | segment			1
Core brand
Segment Reporting Information [Line Items]
Net revenue reclassification	407,785	388,570	$ 1,208,994	1,078,280
Core brand | Impact
Segment Reporting Information [Line Items]
Net revenue reclassification	600
Allied brand
Segment Reporting Information [Line Items]
Net revenue reclassification	39,604	$ 38,261	$ 122,296	$ 117,009
Allied brand | Impact
Segment Reporting Information [Line Items]
Net revenue reclassification	$ (600)