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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
Property, plant and equipment at December 31 consisted of:
 
 
 
2016
 
2015
Land
 
$
19,952

 
$
19,153

Buildings
 
169,695

 
156,294

Machinery and equipment
 
572,540

 
539,360

 
 
762,187

 
714,807

Less accumulated depreciation
 
(427,698
)
 
(405,951
)
 
 
$
334,489

 
$
308,856


 
Depreciation expense was $43,165, $39,654 and $41,875 during 2016, 2015 and 2014, respectively.