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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment consist of the following at December 31:

 20202019
Land$4,027 $4,686 
Building and improvements93,886 95,632 
Machinery and equipment243,810 233,140 
Construction in progress15,680 13,318 
 357,403 346,776 
Less:  Accumulated depreciation(245,996)(227,893)
 $111,407 $118,883 
 
Internal-use software, included in gross machinery and equipment at December 31, 2020 and 2019 was $50.3 million and $49.6 million, respectively, with related accumulated depreciation of $42.9 million and $38.7 million, respectively. Internal use software depreciation expense was $4.7 million, $4.8 million and $4.7 million for the years ended December 31, 2020, 2019 and 2018, respectively. Also, during 2020, we sold a vacant facility for $3.2 million.