Quarterly report pursuant to Section 13 or 15(d)

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

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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment    
Property, plant and equipment, gross $ 207,559 $ 208,697
Less Accumulated Depreciation 82,863 82,867
Property, plant and equipment, net 124,696 125,830
Land    
Property, Plant and Equipment    
Property, plant and equipment, gross 11,212 11,237
Buildings and Improvements    
Property, Plant and Equipment    
Property, plant and equipment, gross 82,000 81,872
Machinery and Equipment    
Property, Plant and Equipment    
Property, plant and equipment, gross 105,991 105,827
Construction in Progress    
Property, Plant and Equipment    
Property, plant and equipment, gross $ 8,356 $ 9,761