Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 161,121		$ 161,121		$ 157,304
Accumulated depreciation	(118,127)		(118,127)		(113,809)
Property, plant and equipment, net	42,994		42,994		43,495
Depreciation expense	2,800	$ 3,600	8,900	$ 10,600
Land [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	2,256		2,256		2,259
Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	30,572		30,572		30,761
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	124,160		124,160		122,773
Construction in Progress [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 4,133		$ 4,133		$ 1,511