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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment are as follows (in thousands):
 
 
 
2016
 
2015
Land and land improvements
 
$
8,537

 
$
9,194

Buildings and building improvements
 
82,440

 
82,206

Machinery and equipment
 
546,425

 
525,914

Furniture and fixtures
 
9,553

 
8,696

Construction in progress
 
10,885

 
10,181

 
 
657,840

 
636,191

Accumulated depreciation
 
(450,161
)
 
(425,613
)
 
 
$
207,679

 
$
210,578