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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment at December 31 consisted of:
 
 
 
2018
 
2017
Land
 
$
23,239

 
$
21,723

Buildings
 
183,544

 
182,226

Machinery and equipment
 
646,714

 
631,392

 
 
853,497

 
835,341

Less accumulated depreciation
 
(482,966
)
 
(476,043
)
 
 
$
370,531

 
$
359,298