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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
 
 
December 31,
(In thousands)
 
2017
 
2016
Machinery and equipment
 
$
2,124,701

 
$
2,000,512

Buildings and improvements
 
340,042

 
328,251

Land improvements
 
49,908

 
47,844

Office and other equipment
 
46,467

 
40,051

Land
 
11,726

 
7,266

Construction in progress
 
114,424

 
103,429

 
 
$
2,687,268

 
$
2,527,353

Less accumulated depreciation and amortization
 
(1,636,286
)
 
(1,582,025
)
 
 
$
1,050,982

 
$
945,328