Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2021

Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment

	September 30, 2021			December 31, 2020
(Dollars in thousands)
Land and buildings	$	129,221		$	149,295
Machinery and equipment		861,218			899,764
Leasehold improvements and others		12,421			14,912
Construction in progress		59,275			46,718
		1,062,135			1,110,689
Accumulated depreciation		(560,363	)		(588,565	)
Property, plant and equipment, net	$	501,772		$	522,124