SEGMENT INFORMATION - Sales and Operating Income of Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Segment Reporting Information [Line Items]
NET SALES	$ 304,151	$ 214,805	$ 897,951	$ 671,674
Operating Income (Loss)	20,117	15,202	68,738	51,136
Intersegment sales [Member]
Segment Reporting Information [Line Items]
NET SALES	6,584	5,076	19,581	15,890
Operating Segments [Member]
Segment Reporting Information [Line Items]
NET SALES	310,735	219,881	917,532	687,564
Operating Income (Loss)	27,359	19,765	92,285	66,152
Manufacturing [Member]
Segment Reporting Information [Line Items]
NET SALES	249,871	169,202	731,885	519,162
Manufacturing [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
NET SALES	5,847	4,531	17,316	13,909
Manufacturing [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
NET SALES	255,718	173,733	749,201	533,071
Operating Income (Loss)	23,578	17,243	80,990	56,775
Distribution [Member]
Segment Reporting Information [Line Items]
NET SALES	54,280	45,603	166,066	152,512
Distribution [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
NET SALES	737	545	2,265	1,981
Distribution [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
NET SALES	55,017	46,148	168,331	154,493
Operating Income (Loss)	$ 3,781	$ 2,522	$ 11,295	$ 9,377