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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 at December 31 consisted of:
 
 
 
2019
 
2018
Land
 
$
17,644

 
$
23,239

Buildings
 
178,657

 
183,544

Machinery and equipment
 
644,339

 
646,714

 
 
840,640

 
853,497

Less accumulated depreciation
 
(484,037
)
 
(482,966
)
 
 
$
356,603

 
$
370,531



Depreciation expense was $47,552, $48,914 and $48,693 during 2019, 2018 and 2017, respectively.