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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
Property, plant and equipment at December 31 consisted of:
 
 
 
2015
 
2014
Land
 
$
19,153

 
$
19,422

Buildings
 
156,294

 
145,142

Machinery and equipment
 
539,360

 
507,661

 
 
714,807

 
672,225

Less accumulated depreciation
 
(405,951
)
 
(372,790
)
 
 
$
308,856

 
$
299,435


 
Depreciation expense was $39,654, $41,875 and $34,419 during 2015, 2014 and 2013, respectively.