PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 155,409		$ 155,409		$ 153,456
Accumulated depreciation	(101,696)		(101,696)		(95,845)
Property, plant and equipment, net	53,713		53,713		57,611	[1]
Depreciation expense	3,700	$ 4,000	7,400	$ 8,100
Land [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	2,242		2,242		2,240
Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	30,726		30,726		29,346
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	119,882		119,882		116,921
Construction in Progress [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 2,559		$ 2,559		$ 4,949

[1] (Revised)