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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
Property, plant and equipment at December 31 consisted of:
 
 
 
2017
 
2016
Land
 
$
21,723

 
$
19,952

Buildings
 
182,226

 
169,695

Machinery and equipment
 
631,392

 
572,540

 
 
835,341

 
762,187

Less accumulated depreciation
 
(476,043
)
 
(427,698
)
 
 
$
359,298

 
$
334,489


 
Depreciation expense was $48,693, $43,165 and $39,654 during 2017, 2016 and 2015, respectively.