Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment and Leased Facilities and Equipment - Summary of Property, Plant and Equipment (Details)

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Property, Plant and Equipment and Leased Facilities and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 214,996 $ 221,073
Accumulated depreciation (144,512) (141,143)
Property, plant and equipment, net 70,484 79,930
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, estimated useful life 25 years  
Property, plant and equipment, gross $ 35,580 34,696
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 126,622 132,155
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,288 2,497
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 2,521 2,627
Improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, estimated useful life 15 years  
Property, plant and equipment, gross $ 40,377 42,182
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 2,636 $ 1,944
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