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Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
Property, plant and equipment consists of the following:
(In thousands)
 
September 30
2017
 
December 31
2016
Land
 
$
10,965

 
$
10,606

Land improvements
 
15,567

 
15,032

Buildings and improvements
 
195,739

 
185,657

Machinery and equipment
 
1,606,633

 
1,525,156

Uncompleted construction
 
23,490

 
21,035

Gross property, plant and equipment
 
1,852,394

 
1,757,486

Less: Accumulated depreciation
 
(1,373,253
)
 
(1,267,231
)
Property, plant and equipment, net
 
$
479,141

 
$
490,255