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Property and Equipment Property, Plant and Equipment
6 Months Ended
Jul. 01, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
Property and equipment, net, consists of the following (in thousands):
 
July 1,
2017
 
December 31,
2016
Building and building improvements
$
86,015

 
$
85,966

Machinery and equipment
43,737

 
41,683

Land
23,762

 
23,762

Leasehold improvements
14,908

 
8,289

Computer equipment
14,199

 
13,549

Tooling
13,485

 
12,895

Furniture and office equipment
10,719

 
9,669

Demonstration units
467

 
448

Vehicles
45

 
45

Construction-in-progress
5,654

 
7,923

     Total property and equipment
212,991

 
204,229

Accumulated depreciation and amortization
(75,268
)
 
(68,233
)
     Property and equipment, net
$
137,723

 
$
135,996


For the six months ended July 1, 2017 and July 2, 2016, depreciation expense of property and equipment was $7.0 million and $6.3 million, respectively.