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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment consist of the following: 
 December 31,
 Useful Life20212020
 (Years)
Land $2,762 $2,724 
Building and improvements
30-40
24,787 25,731 
Office furniture and equipment
5-8
16,620 16,980 
Machinery and equipment
5-7
250,166 237,253 
  294,335 282,688 
Accumulated depreciation and amortization (207,757)(190,007)
Property, plant and equipment, net $86,578 $92,681 
 
Depreciation expense was approximately $25.2 million, $24.7 million, and $24.2 million for the years ended December 31, 2021, 2020 and 2019, respectively.