Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2012

Major Classes of Property, Plant and Equipment, at Cost

The major classes of property, plant and equipment, at cost, at year end are as follows:

	2012			2011
	(Dollars in thousands)
Land, buildings and leasehold improvements	$	201,155		$	189,817
Machinery and equipment		313,325			285,771
Computer equipment and software		70,618			64,076
Construction in progress		41,424			26,390
		626,522			566,054
Less: Accumulated depreciation		(328,577	)		(314,142	)
Property, plant and equipment, net	$	297,945		$	251,912