Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consists of the following:

December 31, (dollars in thousands)	2015		2014
Land	$	19,871	$	20,353
Buildings	102,236		97,485
Machinery and equipment	470,862		448,241
Furniture and fixtures	14,313		15,431
Software	23,630		19,950
Construction in progress	9,137		34,134
Gross property, plant and equipment	640,049		635,594
Less accumulated depreciation	367,515		357,616
Net property, plant and equipment	$	272,534	$	277,978