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Property and Equipment (Tables)
3 Months Ended
Mar. 30, 2019
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property and equipment are stated at cost. Depreciation is calculated using the straight-line method over estimated useful lives as follows:
 
Useful Lives
Aircraft and components
10 to 20 years
Buildings
39 years
Building improvements
7 to 15 years
Computer equipment
2 to 6 years
Demonstration units
3 years
Furniture and office equipment
2 to 6 years
Leasehold improvements
Lesser of useful life or term of lease
Machinery and equipment
5 to 10 years
Tooling
3 years
Vehicles
5 years
Property and equipment, net, consists of the following (in thousands):
 
March 30,
2019
 
December 29,
2018
Building and building improvements
$
90,974

 
$
88,449

Machinery and equipment
57,001

 
54,525

Aircraft and vehicles
25,555

 
25,555

Land
23,762

 
23,762

Computer equipment
18,334

 
16,582

Leasehold improvements
16,896

 
16,428

Tooling
14,465

 
14,212

Furniture and office equipment
10,558

 
10,459

Demonstration units
465

 
470

Construction-in-progress (CIP)
11,360

 
13,320

     Total property and equipment
269,370

 
263,762

Accumulated depreciation and amortization
(102,082
)
 
(97,790
)
     Property and equipment, net
$
167,288

 
$
165,972