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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2020
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:
 
20202019
 (Dollars in thousands)
Land$89,304 $77,233 
Buildings and improvements559,773 493,035 
Machinery and equipment3,337,536 3,009,591 
Construction in progress199,635 167,635 
4,186,248 3,747,494 
Accumulated depreciation(2,345,490)(2,177,163)
$1,840,758 $1,570,331 
 
    Depreciation expense in 2020, 2019 and 2018 was $182.9 million, $179.3 million and $164.1 million, respectively.