INVENTORTIES (Details) - USD ($) $ in Thousands	Sep. 25, 2016	Dec. 31, 2015
Inventory [Line Items]
Raw materials	$ 72,852	$ 52,601
Work in process	6,045	5,529
Finished goods	10,266	10,450
Total manufactured goods, net	86,406	66,683
Materials purchased for resale (distribution products)	31,315	24,406
Total materials purchased for resale (distribution products), net	29,709	22,795
Total inventories	116,115	89,478
Manufactured Goods [Member]
Inventory [Line Items]
Less: reserve for inventory obsolescence	(2,757)	(1,897)
Distributed Goods [Member]
Inventory [Line Items]
Less: reserve for inventory obsolescence	$ (1,606)	$ (1,611)