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Property and Equipment (Tables)
3 Months Ended
Mar. 28, 2020
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
4 to 20 years
Buildings
39 years
Building improvements
7 to 15 years
Computer equipment and software
2 to 12 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 28,
2020
 
December 28,
2019
Building and building improvements
$
101,883

 
$
101,731

Machinery and equipment
60,881

 
58,864

Land
50,411

 
40,216

Aircraft and vehicles
32,145

 
29,934

Computer equipment and software
22,475

 
19,650

Leasehold improvements
16,584

 
15,921

Tooling
15,972

 
15,346

Furniture and office equipment
11,253

 
11,049

Demonstration units
834

 
836

Construction-in-progress (CIP)
58,706

 
39,107

     Total property and equipment
371,144

 
332,654

Accumulated depreciation
(117,988
)
 
(113,102
)
     Property and equipment, net
$
253,156

 
$
219,552