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Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
Property, plant and equipment, net at December 31 was as follows:
 
 
2018
 
2017
 
(Dollars in thousands)
Land
$
73,084

 
$
74,268

Buildings and improvements
467,067

 
445,178

Machinery and equipment
2,912,841

 
2,833,214

Construction in progress
159,758

 
135,126

 
3,612,750

 
3,487,786

Accumulated depreciation
(2,095,240
)
 
(1,997,914
)
 
$
1,517,510

 
$
1,489,872