PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total	$ 355,363	$ 257,722
Accumulated depreciation and amortization	(149,071)	(132,739)
Property, plant and equipment, net	206,292	124,983
Land
Property, Plant and Equipment [Line Items]
Total	7,445	3,124
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	41,533	29,690
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	236,122	174,222
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	8,172	6,561
Capitalized ERP system development costs
Property, Plant and Equipment [Line Items]
Total	35,207	25,606
Computers and computer software
Property, Plant and Equipment [Line Items]
Total	11,641	8,062
Automobiles
Property, Plant and Equipment [Line Items]
Total	5,763	5,280
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 9,480	$ 5,177