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Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
Property, plant and equipment, net at December 31 was as follows:
 
 
2016
 
2015
 
(Dollars in thousands)
Land
$
48,468

 
$
49,049

Buildings and improvements
365,406

 
322,264

Machinery and equipment
2,505,459

 
2,409,820

Construction in progress
118,028

 
196,140

 
3,037,361

 
2,977,273

Accumulated depreciation
(1,880,409
)
 
(1,851,840
)
 
$
1,156,952

 
$
1,125,433