Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consists of the following:

December 31, (dollars in thousands)	2018		2017
Land	$	20,374	$	20,859
Buildings	109,470		107,659
Machinery and equipment	531,838		505,978
Furniture and fixtures	15,668		15,391
Software	25,218		24,464
Construction in progress	24,945		12,933
Gross property, plant and equipment	727,513		687,284
Less accumulated depreciation	462,553		421,609
Net property, plant and equipment	$	264,960	$	265,675