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PROPERTY, PLANT AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2022
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:
20222021
 (Dollars in thousands)
Land$80,115 $84,287 
Buildings and improvements601,368 610,528 
Machinery and equipment3,616,008 3,577,712 
Construction in progress234,388 196,757 
4,531,879 4,469,284 
Accumulated depreciation(2,600,382)(2,475,407)
$1,931,497 $1,993,877 
 
    Depreciation expense in 2022, 2021 and 2020 was $210.2 million, $205.8 million and $182.9 million, respectively.