Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:

Property, Plant and Equipment Classification	Estimated Useful Lives
Buildings and improvements	30-40 years
Machinery and equipment	5-15 years
Office equipment	3-10 years

	As of December 31,
(Dollars in thousands)	2019			2018
Land	$	21,697		$	21,525
Buildings and improvements	165,968			175,279
Machinery and equipment	281,771			256,301
Office equipment	68,349			64,886
Property plant and equipment, gross	537,785			517,991
Accumulated depreciation	(341,119		)	(317,414		)
Property, plant and equipment, net	196,666			200,577
Equipment in process	63,580			42,182
Total property, plant and equipment, net	$	260,246		$	242,759