Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2021

Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment

	June 30, 2021			December 31, 2020
(Dollars in thousands)
Land and buildings	$	148,579		$	149,295
Machinery and equipment		873,928			899,764
Leasehold improvements and others		14,296			14,912
Construction in progress		44,983			46,718
		1,081,786			1,110,689
Accumulated depreciation		(578,700	)		(588,565	)
Property, plant and equipment, net	$	503,086		$	522,124