Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross $ 207,734 $ 208,697
Less Accumulated Depreciation 86,872 82,867
Property, Plant and Equipment, Net of Accumulated Depreciation 120,862 125,830
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 11,191 11,237
Building and Improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 83,812 81,872
Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross 106,327 105,827
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment gross $ 6,404 $ 9,761