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Property, Plant and Equipment
6 Months Ended
Jun. 30, 2013
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
 
June 30,
2013
 
December 31,
2012
Manufacturing equipment
$
176,170

 
$
174,353

Land
8,101

 
8,101

Buildings and improvements
54,129

 
53,792

Office furniture and research equipment
20,659

 
20,241

 
259,059

 
256,487

Accumulated depreciation
(201,113
)
 
(195,795
)
Total property, plant and equipment, net
$
57,946

 
$
60,692


Depreciation expense for the three and six months ended June 30, 2013 was $2.6 million and $5.7 million, respectively.