Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment

Year Ended December 31,	2020			2019
(Dollars in thousands)
Land and buildings	$	149,295		$	158,907
Machinery and equipment		899,764			856,961
Leasehold improvements and others		14,912			12,173
Construction in progress		46,718			30,179
		1,110,689			1,058,220
Accumulated depreciation		(588,565	)		(528,938	)
Property, plant and equipment, net	$	522,124		$	529,282