PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total	$ 376,439	$ 366,198
Accumulated depreciation and amortization	(171,097)	(163,068)
Property, plant, and equipment, net	205,342	203,130
Land
Property, Plant and Equipment [Line Items]
Total	7,434	7,429
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	46,525	42,257
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	237,292	233,063
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	8,377	8,431
Capitalized ERP system development costs
Property, Plant and Equipment [Line Items]
Total	46,120	44,876
Computers and computer software
Property, Plant and Equipment [Line Items]
Total	11,830	11,775
Automobiles
Property, Plant and Equipment [Line Items]
Total	5,392	5,370
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 13,469	$ 12,997