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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
 
Property, plant and equipment consist of the following at December 31:
 
2019
 
2018
Land
$
4,686

 
$
4,027

Building and improvements
95,632

 
92,470

Machinery and equipment
233,140

 
227,795

Construction in progress
13,318

 
8,043

 
346,776

 
332,335

Less:  Accumulated depreciation
(227,893
)
 
(219,090
)
 
$
118,883

 
$
113,245


 
Internal-use software, included in gross machinery and equipment at December 31, 2019 and 2018 was $49.6 million and $47.8 million, respectively, with related accumulated depreciation of $38.7 million and $34.5 million, respectively. Internal use software depreciation expense was $4.8 million, $4.7 million and $4.5 million for the years ended December 31, 2019, 2018 and 2017, respectively.