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Property and Equipment (Tables)
9 Months Ended
Sep. 28, 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):
 
September 28,
2019
 
December 29,
2018
Building and building improvements
$
91,704

 
$
88,449

Machinery and equipment
58,582

 
54,525

Land
40,216

 
23,762

Aircraft and vehicles
28,818

 
25,555

Computer equipment
19,214

 
16,582

Leasehold improvements
17,574

 
16,428

Tooling
15,070

 
14,212

Furniture and office equipment
10,708

 
10,459

Demonstration units
792

 
470

Construction-in-progress (CIP)
37,309

 
13,320

     Total property and equipment
319,987

 
263,762

Accumulated depreciation
(110,529
)
 
(97,790
)
     Property and equipment, net
$
209,458

 
$
165,972