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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 at December 31:

 20232022
Land$4,027 $4,027 
Building and improvements100,299 97,214 
Machinery and equipment283,470 269,745 
Construction in progress25,088 22,161 
 412,884 393,147 
Less:  Accumulated depreciation(292,162)(277,536)
 $120,722 $115,611 
 
Internal-use software, included in gross machinery and equipment at December 31, 2023 and 2022 was $50.0 million and $49.4 million, respectively, with related accumulated depreciation of $47.1 million and $45.7 million, respectively. Internal use software depreciation expense was $1.7 million, $2.1 million and $3.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.