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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, plant and equipment [Abstract]          
Property, plant and equipment, gross $ 159,027   $ 159,027   $ 157,304
Accumulated depreciation (116,083)   (116,083)   (113,809)
Property, plant and equipment, net 42,944   42,944   43,495
Depreciation expense 2,900 $ 3,400 6,100 $ 7,000  
Land [Member]          
Property, plant and equipment [Abstract]          
Property, plant and equipment, gross 2,253   2,253   2,259
Buildings and Improvements [Member]          
Property, plant and equipment [Abstract]          
Property, plant and equipment, gross 30,543   30,543   30,761
Machinery and Equipment [Member]          
Property, plant and equipment [Abstract]          
Property, plant and equipment, gross 123,280   123,280   122,773
Construction in Progress [Member]          
Property, plant and equipment [Abstract]          
Property, plant and equipment, gross $ 2,951   $ 2,951   $ 1,511