PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total	$ 392,062	$ 366,198
Accumulated depreciation and amortization	(188,946)	(163,068)
Property, plant, and equipment, net	203,116	203,130
Land
Property, Plant and Equipment [Line Items]
Total	6,812	7,429
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	46,906	42,257
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	246,868	233,063
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	9,410	8,431
Capitalized ERP system development costs
Property, Plant and Equipment [Line Items]
Total	46,637	44,876
Computers and computer software
Property, Plant and Equipment [Line Items]
Total	13,173	11,775
Automobiles
Property, Plant and Equipment [Line Items]
Total	5,120	5,370
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 17,136	$ 12,997