PROPERTY, PLANT, AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 404,606	$ 405,264
Accumulated depreciation	(232,464)	(240,245)
Property, plant, and equipment, net	172,142	165,019	$ 137,893
Interest Costs Capitalized	300	400	$ 200
Land
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	11,826	13,138
Leasehold improvements
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	41,897	40,765
Buildings
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	63,122	66,262
Office equipment
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	28,596	26,095
Machinery and Equipment
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	226,198	235,320
Construction-in-progress
PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment	$ 32,967	$ 23,684