PROPERTY, PLANT AND EQUIPMENT, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Land	$ 5,603	$ 5,773
Buildings and improvements	169,400	165,322
Equipment	136,599	135,998
Office furniture and equipment	14,975	14,548
Construction in-progress	30,238	25,659
Property, plant and equipment, gross	356,815	347,300
Less: Accumulated depreciation	(137,415)	(133,144)
Property, plant and equipment, net	$ 219,400	$ 214,156