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Property and Equipment
 3 Months Ended
Mar. 30, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment
8. Property and Equipment
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


For the three months ended March 30, 2019 and March 31, 2018, depreciation expense of property and equipment was $4.3 million and $4.0 million, respectively.
The balances in CIP at March 30, 2019 and December 29, 2018 related primarily to capitalized costs associated with the implementation of a new enterprise resource planning software system, capital improvements to various facilities and manufacturing equipment, the underlying assets for which have not been completed or placed into service.