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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment Property, plant and equipment consists of the following:
(In thousands)
 
September 30
2018
 
December 31
2017
Land
 
$
10,874

 
$
10,840

Land improvements
 
15,874

 
14,996

Buildings and improvements
 
192,011

 
198,582

Machinery and equipment
 
1,554,559

 
1,599,713

Uncompleted construction
 
30,608

 
24,387

Gross property, plant and equipment
 
1,803,926

 
1,848,518

Less: Accumulated depreciation
 
(1,343,428
)
 
(1,368,771
)
Property, plant and equipment, net
 
$
460,498

 
$
479,747