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PROPERTY, PLANT AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2023
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:
20232022
 (Dollars in thousands)
Land$82,760 $80,115 
Buildings and improvements611,691 601,368 
Machinery and equipment3,788,029 3,616,008 
Construction in progress255,609 234,388 
4,738,089 4,531,879 
Accumulated depreciation(2,776,504)(2,600,382)
$1,961,585 $1,931,497 
 
Depreciation expense in 2023, 2022 and 2021 was $210.1 million, $210.2 million and $205.8 million, respectively.