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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment consist of the following at December 31:

 20222021
Land$4,027 $4,027 
Building and improvements97,214 95,518 
Machinery and equipment269,745 256,478 
Construction in progress22,161 16,601 
 393,147 372,624 
Less:  Accumulated depreciation(277,536)(263,761)
 $115,611 $108,863 
 
Internal-use software, included in gross machinery and equipment at December 31, 2022 and 2021 was $49.4 million and $49.1 million, respectively, with related accumulated depreciation of $45.7 million and $45.3 million, respectively. Internal use software depreciation expense was $2.1 million, $3.3 million and $4.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. Also, during 2020, we sold a vacant facility for $3.2 million.