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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

4.       Property, Plant and Equipment

 

Property, plant and equipment consist of the following:

 

December 31,  2016   2015 
         
Land and improvements  $1,986   $1,930 
Buildings and improvements   49,183    46,354 
Machinery and equipment   242,169    216,055 
Dies and tools   38,301    44,258 
   $331,639   $308,597 

 

In 2013, the Company revised its estimate of the useful life of machinery and equipment from 10 to 7 years. This change, which became effective December 31, 2013, resulted in increased depreciation expense of $2.5 million and $7.1 million for 2015 and 2014, respectively, and a decrease in depreciation expense of $1.2 million in 2016.