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Property, plant and equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment
The major classes of property, plant and equipment, at cost, at December 31, 2014 and 2013 are as follows: 
 
2014
 
2013
 
(Dollars in thousands)
Land, buildings and leasehold improvements
$
194,923

 
$
199,741

Machinery and equipment
320,999

 
322,060

Computer equipment and software
107,743

 
102,527

Construction in progress
51,834

 
55,092

 
675,499

 
679,420

Less: Accumulated depreciation
(358,064
)
 
(353,520
)
Property, plant and equipment, net
$
317,435

 
$
325,900