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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
(In thousands)
 
2013
 
2012
Machinery and equipment
 
$
1,937,914

 
$
1,866,263

Buildings and improvements
 
304,971

 
299,642

Land improvements
 
54,277

 
52,929

Office and other equipment
 
11,951

 
10,946

Land
 
11,827

 
11,827

Construction in progress
 
40,204

 
37,160

 
 
$
2,361,144

 
$
2,278,767

Less accumulated depreciation and amortization
 
(1,476,446
)
 
(1,401,390
)
 
 
$
884,698

 
$
877,377