INVENTORIES (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Raw materials	$ 162,238	$ 164,408
Work in process	14,272	12,829
Finished goods	28,446	28,341
Total manufactured goods, net	194,833	200,224
Materials purchased for resale (distribution products)	60,918	74,914
Total materials purchased for resale (distribution products), net	59,037	72,674
Total inventories	253,870	272,898
Manufactured Goods
Inventory [Line Items]
Less: reserve for inventory excess and obsolescence	(10,123)	(5,354)
Distributed Goods
Inventory [Line Items]
Less: reserve for inventory excess and obsolescence	$ (1,881)	$ (2,240)