PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total	$ 369,961	$ 257,722
Accumulated depreciation and amortization	(157,925)	(132,739)
Property, plant and equipment, net	212,036	124,983
Land
Property, Plant and Equipment [Line Items]
Total	7,465	3,124
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total	42,868	29,690
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	239,313	174,222
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total	8,557	6,561
Capitalized ERP system development costs
Property, Plant and Equipment [Line Items]
Total	40,324	25,606
Computers and computer software
Property, Plant and Equipment [Line Items]
Total	11,880	8,062
Automobiles
Property, Plant and Equipment [Line Items]
Total	5,728	5,280
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 13,826	$ 5,177