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Property and Equipment (Tables)
 6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
 
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):
 
June 30,
2018
 
December 30,
2017
Building and building improvements
$
88,234

 
$
87,999

Machinery and equipment
51,471

 
47,556

Aircraft and vehicles
25,555

 
25,329

Land
23,762

 
23,762

Computer equipment
16,227

 
15,789

Leasehold improvements
16,141

 
15,326

Tooling
13,976

 
13,754

Furniture and office equipment
10,397

 
9,967

Demonstration units
479

 
486

Construction-in-progress (CIP)
7,771

 
6,365

     Total property and equipment
254,013

 
246,333

Accumulated depreciation and amortization
(89,986
)
 
(82,237
)
     Property and equipment, net
$
164,027

 
$
164,096