PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 163,455		$ 163,804
Accumulated depreciation	(121,591)		(119,872)
Property, plant and equipment, net	41,864		43,932
Depreciation expense	2,500	$ 3,200
Assets held for sale	1,518		0
Land [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	1,430		2,251
Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	29,300		30,119
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	127,488		126,747
Construction in Progress [Member]
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 5,237		$ 4,687

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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Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

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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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