Property and Equipment

12 Months Ended

Dec. 28, 2019

Property, Plant and Equipment [Abstract]

8. Property and Equipment

Property and equipment, net consists of the following (in thousands):



	December 28, 2019			December 29, 2018
Building and building improvements	$	101,731		$	88,449
Machinery and equipment	58,864			54,525
Land	40,216			23,762
Aircraft and vehicles	29,934			25,555
Computer equipment	19,650			16,582
Leasehold improvements	15,921			16,428
Tooling	15,346			14,212
Furniture and office equipment	11,049			10,459
Demonstration units	836			470
Construction-in-progress (CIP)	39,107			13,320
Total property and equipment	332,654			263,762
Accumulated depreciation	(113,102		)	(97,790		)
Property and equipment, net	$	219,552		$	165,972

During the year ended December 28, 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 December 28, 2019 relates primarily to acquisition and improvement costs for a portion of 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 capital improvements to various facilities, the underlying assets for which had not been completed or placed into service.

For the years ended December 28, 2019, December 29, 2018 and December 30, 2017, depreciation expense of property and equipment was $19.1 million, $16.3 million and $15.2 million, respectively.