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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consisted of the following (in thousands):
 
December 31,
2013
 
December 31,
2012
Manufacturing equipment
$
176,730

 
$
174,353

Land
8,101

 
8,101

Buildings and improvements
53,915

 
53,792

Office furniture and research equipment
17,791

 
20,241

 
256,537

 
256,487

Accumulated depreciation
(198,758
)
 
(195,795
)
Total property, plant and equipment, net
$
57,779

 
$
60,692