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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, net at December 31 was as follows:
 
 
2017
 
2016
 
(Dollars in thousands)
Land
$
74,268

 
$
48,468

Buildings and improvements
445,178

 
365,406

Machinery and equipment
2,833,214

 
2,505,459

Construction in progress
135,126

 
118,028

 
3,487,786

 
3,037,361

Accumulated depreciation
(1,997,914
)
 
(1,880,409
)
 
$
1,489,872

 
$
1,156,952


 
Depreciation expense in 2017, 2016 and 2015 was $150.5 million, $129.8 million and $129.0 million, respectively.