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Property, Plant, and Equipment (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
Property, plant, and equipment consisted of the following (in thousands):
 
December 31,
 
2015
 
2014
Land
$
3,951

 
$
3,951

Buildings
23,439

 
23,815

Building improvements
25,741

 
20,929

Leasehold improvements
4,999

 
4,502

Computer hardware and software
35,350

 
29,867

Manufacturing test equipment
16,201

 
14,007

Furniture and fixtures
4,401

 
3,680

 
114,082

 
100,751

Less: accumulated depreciation
(60,797
)
 
(54,788
)
 
$
53,285

 
$
45,963