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Property, Plant and Equiptment (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
(Dollars in thousands)
December 31,
2013
 
December 31,
2012
Land
$
14,986

 
$
15,394

Buildings and improvements
136,959

 
132,673

Machinery and equipment
160,843

 
151,023

Office equipment
34,972

 
34,300

Equipment in process
21,360

 
21,202

 
369,120

 
354,592

Accumulated depreciation
(222,189
)
 
(205,575
)
Total property, plant and equipment
$
146,931

 
$
149,017