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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

4.       Property, Plant and Equipment

 

Property, plant and equipment consist of the following:

 

December 31,  2017   2016 
         
Land and improvements  $1,986   $1,986 
Buildings and improvements   51,361    49,183 
Machinery and equipment   265,772    242,169 
Dies and tools   45,894    38,301 
   $365,013   $331,639