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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment consist of the following: 
 December 31,
 Useful Life20192018
 (Years)
Land $2,672  $2,680  
Building and improvements
30-40
24,537  24,338  
Office furniture and equipment
5-8
17,227  16,170  
Machinery and equipment
5-7
225,974  208,245  
  270,410  251,433  
Accumulated depreciation and amortization (171,803) (157,538) 
Property, plant and equipment, net $98,607  $93,895  
 
Depreciation expense was approximately $24.2 million, $24.2 million, and $22.4 million for the years ended December 31, 2019, 2018 and 2017, respectively.