Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT AND LEASED FACILITIES AND EQUIPMENT (Details)

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PROPERTY, PLANT AND EQUIPMENT AND LEASED FACILITIES AND EQUIPMENT (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 221,073 $ 231,517
Accumulated depreciation (141,143) (142,618)
Property, plant and equipment, net 79,930 88,899
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 4,972 4,972
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 34,696 34,653
Property, plant and equipment, estimated useful life 25 years  
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 132,155 141,704
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,497 4,450
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,627 2,667
Improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 42,182 42,975
Property, plant and equipment, estimated useful life 15 years  
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,944 $ 96
Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 3 years  
Minimum | Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 3 years  
Minimum | Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 3 years  
Minimum | Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 3 years  
Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 25 years  
Maximum | Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 25 years  
Maximum | Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 5 years  
Maximum | Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 5 years