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Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
Property, plant and equipment, net at December 31 was as follows:
 
 
2015
 
2014
 
(Dollars in thousands)
Land
$
49,049

 
$
53,652

Buildings and improvements
322,264

 
320,833

Machinery and equipment
2,409,820

 
2,386,245

Construction in progress
196,140

 
79,291

 
2,977,273

 
2,840,021

Accumulated depreciation
(1,851,840
)
 
(1,776,390
)
 
$
1,125,433

 
$
1,063,631