PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 275,616	$ 245,141
Less: accumulated depreciation	91,370	79,387
Property, plant and equipment, net	184,246	165,754
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,246	4,208
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58,322	45,735
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	192,926	177,841
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 17,122	$ 17,357