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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment $ 365,013 $ 331,639
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 1,986 1,986
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 51,361 49,183
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment 265,772 242,169
Dies and Tools [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant, and Equipment $ 45,894 $ 38,301