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Property and Equipment
 6 Months Ended
Jun. 29, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment
8. Property and Equipment
Property and equipment, net, consists of the following (in thousands):
 
June 29,
2019
 
December 29,
2018
Building and building improvements
$
91,595

 
$
88,449

Machinery and equipment
58,077

 
54,525

Land
40,216

 
23,762

Aircraft and vehicles
25,595

 
25,555

Computer equipment
18,649

 
16,582

Leasehold improvements
17,167

 
16,428

Tooling
14,742

 
14,212

Furniture and office equipment
10,670

 
10,459

Demonstration units
474

 
470

Construction-in-progress (CIP)
32,125

 
13,320

     Total property and equipment
309,310

 
263,762

Accumulated depreciation and amortization
(106,500
)
 
(97,790
)
     Property and equipment, net
$
202,810

 
$
165,972


For the three months ended June 29, 2019 and June 30, 2018, depreciation expense of property and equipment was $5.1 million and $4.1 million, respectively. For the six months ended June 29, 2019 and June 30, 2018, depreciation expense of property and equipment was $9.4 million and $8.1 million, respectively.
During the three months ended June 29, 2019, the Company, through its wholly owned subsidiaries, completed the purchase of two buildings for an aggregate purchase price of $35.6 million.
The balance in CIP at June 29, 2019 related primarily to a recently purchased building and capitalized implementation costs related to a new enterprise resource planning software system, the underlying assets for which have not been completed or placed into service. The balance in CIP at December 29, 2018 related primarily to capitalized costs associated with the implementation of a new enterprise resource planning software system and a capital improvement project at our corporate headquarters, the underlying assets for which had not been completed or placed into service.