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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment consist of the following at December 31:

 20242023
Land$4,027 $4,027 
Building and improvements100,937 100,299 
Machinery and equipment295,839 283,470 
Construction in progress20,409 25,088 
 421,212 412,884 
Less:  Accumulated depreciation(305,419)(292,162)
 $115,793 $120,722 
 
Internal-use software, included in gross machinery and equipment at December 31, 2024 and 2023 was $50.3 million and $50.0 million, respectively, with related accumulated depreciation of $48.1 million and $47.1 million, respectively. Internal use software depreciation expense was $1.4 million, $1.7 million and $2.1 million for the years ended December 31, 2024, 2023 and 2022, respectively.