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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment consist of the following:
 December 31,
 Useful Life20232022
 (Years)(in thousands)
Land $2,453 $2,529 
Building and improvements
30-40
26,663 24,800 
Office furniture and equipment
5-8
21,334 18,057 
Machinery and equipment
5-7
269,306 251,282 
  319,756 296,668 
Accumulated depreciation and amortization (238,784)(219,107)
Property, plant and equipment, net $80,972 $77,561 
 
Depreciation expense was approximately $25.6 million, $24.1 million, and $25.2 million for the years ended December 31, 2023, 2022 and 2021, respectively.