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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment are as follows (in thousands):
 
 
 
September 30,
2017
 
December 31,
2016
Land and land improvements
 
$
8,103

 
$
8,080

Buildings and building improvements
 
78,191

 
77,021

Machinery and equipment
 
521,434

 
517,782

Furniture and fixtures
 
8,729

 
9,124

Construction in progress
 
15,468

 
10,634

 
 
631,925

 
622,641

Accumulated depreciation
 
(440,756
)
 
(423,729
)
 
 
$
191,169

 
$
198,912