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Property and Equipment | 3 Months Ended
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Mar. 31, 2018
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment, net, consists of the following (in thousands):
| March 31, 2018 |  | December 30, 2017
Building and building improvements | $ | 88,215 |  |  | $ | 87,999 |
Machinery and equipment | 49,842 |  |  | 47,556 |
Aircraft and vehicles | 25,329 |  |  | 25,329 |
Land | 23,762 |  |  | 23,762 |
Computer equipment | 15,785 |  |  | 15,789 |
Leasehold improvements | 15,649 |  |  | 15,326 |
Tooling | 13,818 |  |  | 13,754 |
Furniture and office equipment | 10,328 |  |  | 9,967 |
Demonstration units | 491 |  |  | 486 |
Construction-in-progress (CIP) | 6,994 |  |  | 6,365 |
Total property and equipment | 250,213 |  |  | 246,333 |
Accumulated depreciation and amortization | (85,977 | ) |  | (82,237 | )
Property and equipment, net | $ | 164,236 |  |  | $ | 164,096 |
For the three months ended March 31, 2018 and April 1, 2017, depreciation expense of property and equipment was $4.0 million and $3.5 million, respectively. The balances in CIP at March 31, 2018 and December 30, 2017 relate primarily to capitalized costs associated with the implementation of a new enterprise resource planning software system and manufacturing equipment, the underlying assets for which have not been completed or placed into service.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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