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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
Property, plant and equipment consists of the following:
(In thousands)
 
June 30
2018
 
December 31
2017
Land
 
$
10,532

 
$
10,840

Land improvements
 
16,117

 
14,996

Buildings and improvements
 
194,193

 
198,582

Machinery and equipment
 
1,571,753

 
1,599,713

Uncompleted construction
 
27,466

 
24,387

Gross property, plant and equipment
 
1,820,061

 
1,848,518

Less: Accumulated depreciation
 
(1,358,155
)
 
(1,368,771
)
Property, plant and equipment, net
 
$
461,906

 
$
479,747